True. The ability of pacemaker neurons to produce rhythmic bursting activity is a characteristic feature of these cells.
Understanding how many rhythmic activity in neural networks are produced by voltage- and time-dependent ion fluxes in single neurons may be largely dependent on this phenomenon. In addition to rhythmic motor activity, rhythmically active neural networks also contribute to seemingly non-rhythmic behaviors including sleep, arousal, addiction, memory, and cognition. Pacemaker neurons are found in several of these networks. The slow, positive increase in voltage across the cell membrane (the membrane potential) that takes place between one action potential and the start of the next action potential is known as the pacemaker potential or pacemaker current in the pacemaking cells of the heart, such as the sinoatrial node.
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What is a vestigial structure?
Answer:
Structures that have no apparent function and appear to be residual parts from a past ancestor are called vestigial structures. Examples of vestigial structures include the human appendix, the pelvic bone of a snake, and the wings of flightless birds.
Explanation:
please give me brainlist and follow
Answer:
remnant of a structure that may have had an important function in a species' ancestors, but has no clear function in the modern species.
Explanation:
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Which condition is NOT a requirement of the Hardy-Weinberg equilibrium?
A. No mutations in a population
B. No net migration of alleles into or out of the population
C. Sexually reproducing and randomly mating in a population
D. Small population with genetic drift
Answer:
D since people need to produce more, producing in a small population with genetic drift is not a requirement Hardy Weinberg equilibrium
2. What are the steps of the dichotomous key?
Answer:
1.list down the characteristics
2.Organnize the characteristics in order
3.divide the specimens
4.divide the specimens even further
5.draw a dichotomous Key diagram
6. test it out
how is population dynamics in animals affected by sewage water release
plzz helppp
Answer:
It may be that synthesis in population dynamics has been slow to emerge because population change is more complicated than it first appears. After all, population change is determined ultimately by only four factors: birth, death, immigration, and emigration.
Explanation:
Research has shown that population size and growth are important factors in the emission of greenhouse gases. ... While population-driven emissions from developed nations are estimated to contribute 42 percent of CO2 emissions between 1985 and 2020, they are expected to contribute only 3 percent between 2025 and 2100.
If sewage is only partially treated before it is disposed of, it can contaminate water and harm huge amounts of wildlife. Alternatively, leaking or flooding can cause completely untreated sewage to enter rivers and other water sources, causing them to become polluted. The consequences aren't great
Factors influencing population growth
+Economic development. ...
+Education. ...
+Quality of children. ...
+Welfare payments/State pensions. ...
+Social and cultural factors. ...
+Availability of family planning. ...
+Female labour market participation. ...
+Death rates – Level of medical provision.
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Earth is made up of
layers.
Answer:
multiple different layers and that's how we also have different types of rocks like sedimentary
AYO PLS HELP...... condon amino acids ect
27)
Natural selection produces changes most quickly in
A)
species with short reproductive cycles
B)
complex multicellular organisms
C)
individuals that produce a small number of offspring
D)
individual pathogens killed by antibiotics
Answer:
A) species with short reproductive cycles
Help will mark brainiest
Answer:
Amino acids are the building blocks of proteins
There are many possibilities that could happen if the sequence of amino acids were to change. It could potentially create a completely different protein with a different function, or it could create a more efficient protein but this is less likely.
Explanation:
Cancer is caused by __________ in genes that regulate the cell cycle. These mistakes in DNA, cause the checkpoint __________ to not function properly. As a result the cells will spend more time dividing, which is called _____________ rather than in interphase.
Explanation:
cancer cause due to uncontrolled divisions of the cell because of gene mutations or presence of oncogenes which destroy or destabilise the checkpoints that prevent or controll cell division
PLEASE HELP
Which of the following is not a random occurrence?
A selection of the best-suited traits for the environment, leading to adaptive evolution
Genetic drift changing the gene pool of a population and creating fluctuations in the allele frequencies
The bottleneck effect after an earthquake, resulting in a reduction of genetic variation
The founder effect, when a small population is isolated and the gene pool significantly reduced from the parent population
Answer: A selection of the best-suited traits for the environment, leading to adaptive evolution brainliest
Explanation:
What are the similarities and differences between a nerve cell and a typical animal cell?
Answer:
Hi Rudaba
Where r u from ??
I am Ahaana
Cells are the structural and functioning units of all living organism. They formed the foundation all living organism.
Based on location and functions, there are different types of cells. Because some cells transfer messages from one part of the body to another, they are have a head like structure(the cell body) and a a long pipe shaped structure (axon) and with branches at the end ( dendrites) .These cells are nerve cells. They are located in the CNS and PNS.
Other cells on animals have almost the same shape with some variations.
Similarities.
Both contains Nucleus, mitochondria
Both contains fluid inclusion called cytoplasm where all organelles,
Both bounded layer of cell membranes to restrict movement the cells organelles and to give shapes.
Differences;
Typical animals cells are of different colors based on location in organs .But
nerve cells are made of the grey color ( granules) of the cell body and white color of the axon. This is uniform for all nerve cells.
Animal cells performs different functions in animals based on location, but nerve cell is for transmission of impulses and action potential only.
Animal cells undergo regeneration after death or damage. The Regeneration of nerve cells is slow or not possible in most cases. This is the reasons why most neurological disease are incurable.
Animal cells are made up of three distinct parts: the cell membrane, cytoplasm and the nucleus. Cell body, axon and dendrite are the parts of a nerve cells.
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Photosynthesis occurs in plants in specialized organelles called ____. *
A. Golgi bodies
B. chloroplasts
C. mitochondria
D. lysosomes
Answer:B chloroplast
Explanation:
Answer:
Photosynthesis occurs in chloroplasts
B. Chloroplasts
Explanation:
Son Órganos que desempeñan la misma función, pero tienen una constitución anatómica diferente, hablamos de
Answer:
órganos análogos
Explanation:
Los órganos análogos son aquellos que cumplen la misma función (o similares funciones), pero no poseen un origen evolutivo en común. Por otra parte, los órganos homólogos son aquellos que poseen un origen evolutivo común (es decir, derivan de un ancestro en común). Los órganos análogos pueden ser distinguidos durante desarrollo embrionario ya que ellos experimentan diferentes mecanismos para su formación. Estos órganos (análogos) han experimentado evolución convergente, es decir, representan estructuras similares las cuales han evolucionado a partir de organismos que no tienen un antepasado en común. Un ejemplo de órgano análogo es la presencia de alas en murciélagos y abejas.
what is the difference between the open-water zone and the deep water Zone
GIVING 100 BRAINLY POINTS AND BRAINLEST.
Part A Cut a 7-inch-diameter circle out of card stock. Draw a spiral on the circle as shown. Next, use the scissors to cut along the lines you drew starting on the outside and ending in the center. Use the hole punch or scissors to make a hole at the middle of the spiral and attach the thread with a knot. Tie the other end of the thread loosely around the center of the stick so you can suspend the spiral in the air. Fill the pot with 2 inches of water. Heat the water until it boils, and then turn off the heat source. Let the pot sit for 4 minutes. Holding the ends of the stick with the spiral attached, position the bottom of the spiral right above the top of the pot so it’s not touching the water. Describe what happens.
Answer:
the spiral stick wouldnt be wet because it isnt touching the water, so therefore the sprial stick wouldnt be hot because it isnt touching the water.
Explanation:
Answer: yeah it’s 50.
Explanation:
b) How does adaptation affect the survival of a species? Why?
In evolutionary theory, adaptation is the biological mechanism by which organisms adjust to new environments or to changes in their current environment. This enables better survival and reproduction compared with other members of the species, leading to evolution.
Explanation:
If you want more info, you can check out this site. It is safe and secure.
https://www.nationalgeographic.org/encyclopedia/adaptation/
When a person is suddenly cut by a sharp object, a nervous impulse is sent along a sensory neuron to the spinal cord. The impulse is immediately transmitted through motor neurons to produce a response. Which of the following correctly identifies and describes this response?
A.It is a leamed response that does not occur in infants and small children
B. It is a reflex response that causes various muscles to contract in order to move away from the object.
C.It is a conditioned response that occurs only to prevent injury!
D. It is a voluntary response that is initiated only after the impulse has been caried to the relevant area of the brain.
Answer:
B. It is a reflex response that causes various muscles to contract in order to move away from the object.
Explanation:
I just took the Test
It is a reflex response that causes various muscles to contract in order to move away from the object. Therefore, option (B) is correct.
What is reflex response?A reflex response is an automatic, involuntary response to a stimulus that does not involve the conscious part of the brain. In this case, the reflex response causes various muscles to contract in order to move away from the sharp object, which helps to minimize further injury. Reflexes are a protective mechanism that can operate without the need for conscious control or decision making.
The reflex response described in this scenario is not a learned response, a conditioned response, or a voluntary response. It is an innate, automatic response that occurs in response to a specific stimulus, and it occurs in both infants and adults.
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The DNA sequences of whales and ungulates, or hooved animals, are very similar. What type of evidence of evolution is this?
O vestigial
O molecular
O embryological
fossil
PLEASE HELP
Which of the following is the best example of gene flow?
Wind blows pollen from one population of plants to another, and cross-fertilization occurs.
An earthquake results in the formation of a canyon, splitting a population of toads apart.
Genes are shuffled by the crossing over of chromosomes during meiosis.
A small population of humans colonizes a newly formed island.
Answer: Wind blows pollen from one population of plants to another, and cross-fertilization occurs. brainliest?
Explanation:
The best example of gene flow is Wind blows pollen from one population of plants to another and cross-fertilization occurs.
What do you mean by pollination?A pollinator is anything that helps carry pollen from the male part of the flower (stamen) to the female part of the same or another flower (stigma).
Self-pollination is the transfer of pollen from the anther to the stigma of the same flower.
Cross-pollination is the transfer of pollen from the anther of one flower to the stigma of another flower on a different.
Thus, option A is correct, as pollination leads to fertilization which involves the gamete's interaction.
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which of these is a plantation crop?
a)Coffee
b)Tea
c)Spices
d)All of these
choose one
Answer:
D) All Of These
Explanation:
Tea, Coffee, and Spices are a plantation crop.
Answer:
the right answer is D all of these
PLEASE HELP ME!!!!
IT IS FOR BIOLOGY!!!
Answer:
d. selective breeding
Explanation:
Use the following dichotomous key to identify an irregular blue flower with five petals and a fruit that is a ripened flower ovary or follicle. Dichotomous Key of Ranunculaceae #1. a. Fruit is a group of alkenes. (go to step 2) b. Fruit is a group of follicles. (go to step 4) #2. a. Petals are not present. (go to step 3) b. Petals are present. (Ranunculus) #3. a. The flower has 4 sepals. (Clematis) b. The flower has 5 sepals. (Anemone) #4. a. The flowers are regular. (Aquilegia) b. The flowers are irregular. (Delphinium) The flower is a: A. Anemone B. Clematis C. Delphinium D. Ranunculus
Question:
Use the following dichotomous key to identify an irregular blue flower with five petals and a fruit that is a ripened flower ovary or follicle.
Dichotomous Key of Ranunculaceae
#1.
a. Fruit is a group of alkenes.............................. go to step 2
b. Fruit is a group of follicles..............................go to step 4
#2.
a. Petals are not present.....................................go to step 3
b. Petals are present............................................Ranunculus
#3.
a. The flower has 4 sepals.................................. Clematis
b. The flower has 5 sepals................................... Anemone
#4.
a. The flowers are regular..................................... Aquilegia
b. The flowers are irregular................................... Delphinium
The flower is a: A. Anemone B. Clematis C. Delphinium D. Ranunculus
Answer:
The species belongs to Delphinium genera.
Explanation:
A dichotomous key is relatively simple to interpret. All you need to do is to:
- carefully observe your organism,
- know some technical terms or have a biological dictionary, and
- follow the descriptions.
The dichotomous key is going to lead you to the answer.
In the example, we have a plant species with irregular blue flowers and five petals. The fruits are a ripened flower ovary or follicles.
Irregular flower: Term that refers to asymmetrical flowers that only have one plane. Follicle: Term that refers to dry dehiscent fruits originated from a flower with only one carpel. When mature, they open by the ventral suture.So, let us begin, step by step. For each number, we are going to have two options (a and b). By knowing our organism, we need to decide which one is correct and follow indications.
#1.
a. Fruit is a group of alkenes.............................. go to step 2.
b. Fruit is a group of follicles..............................go to step 4.
We know that our fruit is a follicle. Option a is not correct (it is not a group of alkenes). Option b is the correct one. Knowing this, we must go to step four. ***Note: In the hypothetical case that the fruits were a group of alkenes, and option a was correct, we should go to step two, as indicated***.
#4.
a. The flowers are regular..................................... Aquilegia
b. The flowers are irregular................................... Delphinium
We know that our flower is an irregular one. So the correct option is b. This option leads us to Delphinium genera. Our species belongs to this taxonomic group. ***Note: In the hypothetical case that the fruit was actually a regular flower, and option a was correct, our species would belong to Aquilegia genera***
What’s the answer to this I didn’t mean to click this btw
10. Explain why the feel of gypsum and talc can be used to distinguis
between the minerals?
which of the following properties of water are essential for life on Earth?
Answer:
Option D
Explanation:
Complete question
which of the following properties of water are essential for life on Earth?
A) polarity
B) Cohesion & Adhesion
C) High heat capacity
D) All the above
Solution
Some essential properties of water are as follows –
a) Polarity
b) Solvent
c) High heat capacity - it is essential to maintain the temperature on earth. The water bodies are comparatively cooler than the temperature of earth
d) High heat of vaporization
e) Cohesion – It is essential for surface tension & capillary action
f) Adhesion – It is essential for surface tension & capillary action
g) Lower freezing density – Due to this reason, ice is lighter than water
Hence, option D is correct
DNA controls the structure and function of a cell because...
Answer: it makes up the cell or it’s the to-do of the cell kinda like coding
Explanation:
When the heart is in fibrillation, A) there is no contraction of the myocardium. B) effective pumping of the ventricles ceases because the myocardial cells fail to work as a team, and the brain cannot get adequate oxygen. C) the myocardial cells may become damaged from contracting too fast. D) the myocardial cells deplete their oxygen supply because they are contracting too fast, and the lactic acid produced damages the myocardial cells. E) the myocardial cells are contracting together as they should; fibrillation indicates a normal sinus rhythm of 75 beats per minute.
Answer:
The correct answer is - B) effective pumping of the ventricles ceases because the myocardial cells fail to work as a team, and the brain cannot get adequate oxygen.
Explanation:
When the heart is in an irregular and rapid heart rate due to chaotic electrical signals in the atrial chambers of the heart which leads to a very fast heart rhythm that shows 100 to 175 heart rate. That leads to failure of the myocardial cells that stop the pumping of the ventricles effectively and therefore blood would not reach the brain and the brain would not get an adequate amount of oxygen. This will result in organisms experiencing faint, blackout or stroke-like complications.
6. The absorbed dose of electrons is 50 mrad. What is the equivalent dose in J/kg?
O 5.0 x 10-4 g/kg
500 J/kg
5.0 x 10-3 J/kg
50 J/kg
Answer:
5.0 x 10-4 g/kg
Explanation:
This is because
I mrad is equivalent to 1/100,000j/kg
Therefore,
To convert 50 mrad to j/kg
= 50/100,000
= 5 × 10^-4j/kg.
Millirad is a decimal unit or rad which is the unit for measuring absorbed ionization radiation.
What is a mixture where the composition is not uniform
Hello!!
Heterogeneous would be the answer here. The definition of heterogeneous is: composed of dissimilar parts which can be separated easily and which are unevenly distributed in the mixture. So, heterogeneous would be a mixture where the composition is varied.
Hope this helps!!
3. The leaf relates to ____ because it's cells are numerous in
chloroplast
Answer:
photosynthesis
Explanation: