The bone sample is 27,140 years old.
First, calculate the ratio of disintegrations per minute per gram of the mammoth with that of living organisms.
Ratio = 0.50dis/mingC / 15.3dis/mingC
Ratio = 0.0327
The ratio is equal to
Ratio = 2^-(t / t_0.5)
log(Ratio) = -(t / t_0.5) * log2
t = -t_0.5 * log(Ratio) / log2
= -5730yr * log0.0327 / log2
= -5730yr * (-1.4257) / 0.30103
t = 27,140years
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Someone please help
Answer:
1)Increase
2) oxygen and nitrogen
Explanation:
1) increases b/c if radiation is not going into space, its just staying in our atmosphere and heating stuff up cuz radiation is just heat.
2) This I am not 100% sure but it should be oxygen and nitrogen based on what I found on the web. https://chandra.harvard.edu/xray_astro/absorption.html
In this experiment, optical density is measured using a _______. In this experiment, optical density is measured using a _______. microscope thermocycler spectrophotometer caliper
In this experiment, optical density is measured using a spectrophotometer.
The spectrophotometer is a device that calculates how much light a substance absorbs. The spectrophotometer measures the light intensity of a sample by passing a light beam through it. Based on the Beer-Lambert rule, spectrophotometers may determine a solution's concentration by measuring the light intensity with wavelengths.A spectrophotometer is a device that counts the number of photons (light's energy) absorbed after they have passed through a sample solution. By measuring the intensity of light detected, the spectrophotometer may also estimate the quantities of a known chemical compound.
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5. Which component of the lymphatic system filters lymph from the upper limbs and upper external part of the thorax
The subclavian trunks of the lymphatic system filter lymph from the upper limbs and upper external part of the thorax.
The lymphatic system is an open system and is a part of the immune system. It consists of lymphatic vessels, lymph nodes, lymphoid tissues, and organs.
The lymphatic system is responsible for the circulation of a clear fluid which is known as the lymph.
The lymph contains lymphocytes which help in fighting against infections and diseases. The lymphocytes are produced in the primary lymphoid organs which are the thymus and bone marrow.
The subclavian trunks are formed after the unification of the efferent vessels of the subclavicular groups.
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The MOST distinctive feature of ape dentition, which clearly distinguishes apes from Old World monkeys, is
The most distinctive feature of ape dentition, which clearly distinguishes apes from Old World monkeys, is a Y-5 molar pattern.
What is the Y-5 molar pattern?This is a distinctive type of molar teeth pattern found in apes and hominoids.In this, 5 cusps or raised surfaces are present on the grinding surface of teeth, roughly forming a Y- shape. Therefore, this is also known as Y-5 pattern.Whereas Old world monkeys have only 4 cusps on their lower molars present in a bilophodont pattern.A Y-5 molar is formed when the tooth is divided into different pieces which form the complete structure of the tooth.In bilophodont pattern the tooth is divided into 2 symmetric sections.The dental formula of apes is 2.1.2.3/2.1.2.3 i.e. 2 incisors, 1 canine, 2 premolars, 3 molars.Learn more about dentition in apes here:
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Somebody Help me please
Answer:
shorter, more
Explanation:
When a gamma ray and a radio wave are compared, a gamma ray has a shorter wavelength and more energy than a radio wave.
"Dave", the feathered lizard fossil is thought of as a(n) ______________________ species, or an organism that may represent a common ancestor shared by different but related lineages of organisms
"Dave", the feathered lizard fossil is thought of as a(n) homologous species, or an organism that may represent a common ancestor shared by different but related lineages of organisms.
What is homologous evolution?Homologous evolution is similarity of the structure, physiology, or development of different species of organisms based upon their descent from a common evolutionary ancestor.
Homologous structures include the human arm, a bird or bat's wing, a dog's leg, a dolphin or whale's flipper, and the wing of a bird or a bat. They are distinct and serve different purposes, although they are comparable and have similar characteristics. They are regarded as homologous structures because their underlying anatomies are comparable.
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Once a subspecies evolves into a species, it may be unable to breed with another group from its original species. Barriers to this kind of reproduction include
Group of answer choices
geographic isolation.
infertility.
all of the choices.
lack of physical attraction.
What can DNA be compared to?
A. a dictionary
B. a book
C. a virus
D. a computer program
what is the end result of miosis
state the application of binomial nomenclature in naming organism
Answer:
simplifies the study of names of organisms in common language worldwide to all scientists
9. Which of the following is the example of the action of the autonomous nervous system? A. Kicking a ball B. Swinging of arms C. Swallowing of food D. Movement of food in small intestine.
Answer:
Your answer will be D. Movement of food in small intestine.
Explanation:
SOOOOO, here's a shorter, simplified answer for you:
When you digest things, you don't control it, like you can't tell your stomach to stop moving or your heart to stop beating. That's why it's called the "Autonomous Nervous System." Meaning that it's automatic, you don't have to think about it all the time...
Hope this helps you!
What is a response?
A. the transmission of a signal through neurons
B. a change in the environment around an
organism
C. how an organism answers to a change in its
environment
D. the senses recognizing the surroundings
A response is how an organism answers to a change in its environment, which is option B. Details about response can be found below.
What is a response?A response in biology refers to any behavior of a living organism that results from an external or internal stimulus in the environment.
A stimulus is something external that elicits or influences a physiological or psychological activity or response.
Therefore, it can be said that a response is how an organism answers to a change in its environment (stimulus).
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The first step in most stoichiometry problems is to
a. add the coefficients of the reagents
b. convert given quantities to moles
c. convert given quantities to volumes
d. convert given quantities to masses
The first step in stoichiometric problems would be to convert given quantities to moles.
Solving stoichiometric problemsStoichiometric problems make use of the number of moles of individual components of reactions.
Thus, apart from the stoichiometric number of moles that are obtained from the balanced equations of reactions, the first step would be to convert any given quantity to the number of moles.
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Cross-contamination can occur when uncooked foods containing live microbes come into contact with foods that have already been cooked. true false
Answer:
True
Explanation:
Cross-contamination is how bacteria can spread. It occurs when juices from raw meats or germs from unclean objects touch cooked or ready-to-eat foods.
i think it's the correct answer
Why do you think it is important to study the science of human life (biology) in psychology
Answer:
to understand the human and animal behaviour
Explanation:
By looking at the biological bases of human behavior, psychologists are better able to understand how the brain and physiological processes might influence the way people think, act, and feel.
The P50 for myoglobin is 2.8 torr. At what oxygen concentration will myoglobin be 75% saturated with oxygen
At 8.4 torr myoglobin will be 75% saturated with oxygen.
Calculation :
P50 is the partial pressure of the system. To achieve 50% saturation of oxygen to bind to myoglobin, the partial pressure needed is P50
P50 =2.8 torr
so, Mb+ O2 = MbO2
K= [Mb] [O2]/[MbO2]......................(1)
Yo2 ( fractional saturation of myoglobin )
Yo2=[MbO2]/[Mb]+[MbO2]..........................(2)
From equations (1) and (2)
We get Yo2= [O2]/K+[O2]= Po2 /K+ Po2
i)Yo2= 50% =2.8/K+2.8
0.5= 2.8/k +2.8
So, K= 2.8
ii) 75 % = [O2]/K+[O2]= [O2]/2.8+ [O2] = 8.4
Therefore, the oxygen concentration will be 8.4 torr.
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The ocean and the atmosphere serve aa long term storage areas for carbon and other nutrients.
The ocean and the atmosphere serve as long term storage areas for carbon and other nutrients which is referred to as reservoirs.
What is a Reservoir?This is referred to an area of water which contains various forms of nutrient in excess quantities.
It serves as a storage area and example include carbon sink where carbon compounds such as coal are found. This is therefore the reason why reservoir is the most appropriate choice.
The options include the following:
reservoirsfossil fuelsbiostoragescompoundsRead more about Reservoir here https://brainly.com/question/12725067
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Drag the tiles to the correct boxes to complete the pairs.
Match each cause with the effect it had on jews during their time in Nazi ghettos.
1. The Nazis did not bother to arrange for the safe disposal of human waste and garbage in the ghettos. > answer
diseases were rampant in the ghettos
2. Food and other necessities became scarce in the ghettos.> answer
Many Jews died of starvation and poor health
3. The Nazis used healthy Jewish prisoners to perform hard labor.>
answer
Weak and sick Jews were the first to be deported to concentration camps.
these are the answers i just took the test!!
Explain how african feminism can help you to implement equal opportunities for male and female teachers at your school.
African feminism can help you implement equal opportunities because it is a movement that fights for social equality and rights for women and seeks to combat the social model based on patriarchy and abuse and violence against women.
What does feminism stand for?Feminism is a social movement for civil rights, led by women, which from its origins claims
politicallegal and social equalitybetween men and women. Its performance is not sexist, that is, it does not seek to impose some kind of female superiority, but equality between the sexes.
With this information, we can conclude that In feminism, the woman thinks she is superior to the man in many other ways.
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In an energy pyramid, the amount of energy at the producer level is 475,650 kilocalories. the pyramid has four trophic levels, including the producer level. assuming that 10% of the energy is retained at every level, how much energy is available for the second-level consumers? the energy available for the second-level consumers is kilocalories.
The energy available for the second-level consumers is 4756.5 kilocalories.
A trophic level is a position in the food chain or nutrient cycle of an ecosystem. Based on their eating habits, organisms in a food chain are divided into various levels. The first trophic level is usually occupied by producers that can synthesize their own food.
The efficient energy transfer from one trophic to another is only 10% rest of the energy is lost in the ecosystem. The studies of the transfer of energy in different food chains in a large number of ecosystems have revealed a uniform pattern, which is stated as the 10 percent law by Lindemann. According to this law, only 10 percent of the energy entering a particular trophic level of organisms is available for transfer to the next higher trophic level.
Calculation:
Producers (475650 kilocalories) —> Primary consumers (10% of 475650 = 47565 kilocalories) —> Secondary consumers (10% of 47565 = 4756.5 kilocalories).
So, the energy available for second-level consumers is 4756.5 kilocalories.
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Answer:
4756.5
Hope this helps!
Explanation:
Though we have found the remains of many dinosaurs, the record is incomplete as paleontologists often do not find full skeletons. What factors would be involved in an incomplete record of dinosaurs? Select all that apply.
The following options are correct:
Their large size prevented undisturbed burial and fossilization.Much of the large corpse would have been scavenged.Dinosaur bone tends to dissolve in waterDue to the fact that many early forms of life had large and soft bodies, the fossil record contains gaps. Soft creature parts do not make good fossils while, Their large size prevented undisturbed burial and fossilization.. This indicates that little is known about how these organisms appeared. Any fossil remains that may have existed have likely been obliterated by geological processes.Their bones were dispersed, frequently over very large distances, as a result of tectonic movements, weathering, and environmental changes. After dying, the majority of organisms decayed or were consumed by scavengers. Since hard parts are significantly more prone to fossilize, many animals lacked them.All of the squishy components of its body disintegrate as it decays, leaving only the hard components, like as bones, teeth, and horns, to remain. Water in the adjacent rocks has surrounded these tough rocks for millions of years. parts, and minerals in the water replace them, bit by bit.learn more about fossilization of dinosaurs here: https://brainly.com/question/10821025
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True or false: The integument is strictly composed of the skin. It does not include the various accessory structures that may be present on or beneath the skin layers.
The statement that the integument is strictly composed of the skin and It does not include the various accessory structures that may be present on or beneath the skin layers is False.
Composition of integumentTogether with the underlying epidermal cells that secrete the cuticle, the cuticle and integument make up the skin. The cuticle functions as the insect's exoskeleton, the location of muscle attachment, and the first line of protection against fungi, bacteria, predators, parasites, and environmental toxins, including pesticides. The integument plays a role in behavior, osmoregulation, water control, eating, excretion, desiccation resistance, and as a food reserve. The complexity of the structure and chemistry of an insect's integument as well as the unique ways in which it has been modified to work within its owner's environment serve as some indicators of the variety of roles that these coverings play.To learn more about the Skin layers refer to:
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A mutation occurred in a population of wombo birds. Birds with the mutation are able to eat mangoes but those without the mutation
cannot. Birds with the mutation no longer fly north during winter and stay to feed on mangoes. What is likely to happen over time?
OA they will evolve into a new species that can't breed with the other wombo birds
OB. the other wombo birds will evolve and become mango eaters too
OC. a new species of mangoes will evolve and live along the wombo birds migration route
OD. they will eat all the mangoes and start migrating again
A mutation occurred in a population of wombo birds, and birds with the mutation are able to eat mangoes, but those without the mutation cannot. This is due to the fact that the other wombo birds will evolve and become mango eaters too, which is option B. So option B is the correct answer.
Since birds with the mutation can eat mangoes, and mangoes appear to be a valuable food resource, natural selection will likely favor the birds with the mutation. As a result, over generations, more and more birds in the population will carry the mutation, and eventually, the entire population may evolve to become mango eaters. This process may take time, and the rate of evolution will depend on factors such as the size of the population, the rate of mutation, and the availability of mangoes as a food source.
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If a post-synaptic ionotropic receptor is permeable to potassium and assuming all normal ionic distributions, the response in the post synaptic cell will be...
If a post-synaptic ionotropic receptor is permeable to potassium and assuming all normal ionic distributions, the response in the post synaptic cell will be inhibitory.
Ion channels that open in response to the binding of a neurotransmitter are known as ionotropic receptors, also known as neurotransmitter-gated or ligand-gated channels. If there is a synapse, they can be found anywhere along the neuron, though they are typically found around the dendrites or cell body.Ligand-gated channels play a crucial role in the transmission of information from one neuron to another.Postsynaptic receptors can identify two different kinds of neurotransmitters. The action potential is swiftly transmitted by ionotropic receptors, also known as ligand-gated ion channels, to depolarize the neuron (or hyperpolarize the neuron and inhibit additional action potentials).learn more about ionotropic receptor here: https://brainly.com/question/9713967
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The tarsier Group of answer choices is unquestionably a prosimian/Strepsirhines is more closely related biochemically to anthropoids/Haplorhini than to prosimians. is a hominin is a New World monkey.
The tarsier is more closely related biochemically to anthropoids/Haplorhini than to prosimians.
Prosimians include monkeys, apes, and humans (simians), however tarsiers are more closely linked to anthropoids/Haplorhini than other prosimians.This position on the primate family tree, where tarsiers resemble monkeys and apes more than lemurs and lorises,In contrast to lemurs, which have epitheliochorial placentas, they have hemochorial placentas that give birth to rather big children. Monthly sexual cycles in female tarsiers are accompanied by swellings resembling those in several Old World monkey species.learn more about tarsier here: https://brainly.com/question/926621
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what is a membrane???????
Answer:
Membrane is a barrier which protects what comes in and out...
Explanation:
Hope It Helps!!!
A membrane is a thin wall or layer made up of biological substances such as cellulose or lipid.
What is the role of a membrane?A membrane is a thin sheet that protects the cell from the outer environment, and they make a sheet or separation between the cell interior and the exterior.
It helps in the transfer of material from the cell and in the cell and gives the cell structure and rigidity.
Thus, A membrane is a thin wall or layer comprised of cellulose or lipids, which are biological materials.
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Are there any parts of the human body that get oxygen directly from the air and not from the blood?
Answer:
The cornea is the only part of a human body that has no blood supply; it gets oxygen directly through the air.
Explanation:
Answer:
Yes. Upper-layer skin cells and the cells in the front surface of the eyes get a significant amount of oxygen directly from the air
Explanation:
What is DNA replication and what are the steps 50 POINTS pls help fast
Answer:
In molecular biology, DNA replication is the biological process of producing two identical replicas of DNA from one original DNA molecule. Replication occurs in three major steps: the opening of the double helix and separation of the DNA strands, the priming of the template strand, and the assembly of the new DNA segment!! :)
A metastasis is _________. (a) a secondary tumor in a different part of the body that arises from a cell from the primary tumor. (b) a cell that is dividing in defiance of normal constraints. (c) a part of the primary tumor that has invaded the surrounding
A metastasis is a secondary tumor in a different part of the body that arises from a cell from the primary tumor (option A).
What is metastasis?A metastasis in medicine refers to the transference of a bodily disease to another part of the body.
It is specifically the development of a secondary area of disease remote from the original site e.g in cases of cancers.
Therefore, if a secondary tumor arises in a different part of the body from a cell from the primary tumor, it is called metastasis.
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Why is salivary amylase active for only an hour or so, whereas lingual lipase isn't active until reaching the stomach
Salivary amylase will be active for only an hour or so because the optimum pH for activity of amylase is about 6.7–7.0 which is available in the mouth but the pH of the stomach is acidic around 1-2 due to which the amylase enzyme becomes inactive in short-time.
The lingual lipase enzyme is present in the saliva but isn't active until reaching the stomach because this enzyme is acid stable and works efficiently in the stomach, not in the mouth.
Amylase enzyme is secreted in the mouth and is responsible for the breakdown of starch in food into sugars and it starts acting as soon as we put food in the mouth whereas Lingual lipase enzyme is secreted along with saliva but it is not active in the mouth rather its activity starts in the stomach which is responsible for the degradation of triacylglycerol molecules.
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