Answer:
The correct answer is: E) Lymphocytes, cytokines, macrophages.
Explanation:
Given the symptoms and how much time they took to appear, the 14-year-old boy seems to be having delayed-type hypersensitivity (also called Type 4 hypersensitivity), causing a reaction called Contact Dermatitis. Type 4 is the only type of hypersensitivity that does not require the intervening of an antibody to occur as it happens because of hapten-specific T cells that will generate inflammation and the tissue damage that is usually accompanied by it.
Delayed-type hypersensitivity is characterized for happening at least 48 hours after the contact with the antigen, and will involve activated T lymphocytes (specifically CD4+ Th1), which will secrete cytokines (most importantly Interferon Gamma and IL-2) thus attracting macrophages to the tissue to phagocyte the antigen and produce inflammation.
Community ecologists study the factors that determine the abundance of different species. The Abundance of three algae species (in mg/mL) is quantified in two different lakes before and after an unusually hot summer. The coordinates of these four samples inR3are (i) Lake A: (97,84,43)and (100,80,50) before and after summer, respectively, and (ii) Lake B: (23,59,22) and (20,63,15)before and after summer, respectively.(a) How does the magnitude of the change in algal community compare between the two lakes
Answer:
Explanation:
Given that:
The abundance of three algal species in Lake A is now represented by the vectors:
[97, 84, 43] and [100, 80, 50]
Now if we look at Lake A, the change occurring in the vector of algae species can be determined as:
a = [100 -97, 80 - 84. 50 - 43]
a = [3, -4, 7]
Thus, the magnitude of that change is:
[tex]|a| = \sqrt{(3)^2 +(-4)^2+(7)^2}[/tex]
[tex]|a| = \sqrt{9+16+49}[/tex]
[tex]|a| = \sqrt{74}[/tex]
[tex]|a| =8.6 \ mg/mL[/tex]
The abundance of three algal species in Lake B is now represented by the vectors:
[25, 59, 22] and [20, 63, 15]
At Lake B, the change occurring in the vector of algae species can be determined as:
b = [20 -23, 63 - 59. 15 - 22]
b = [-3, -4, -7]
Thus, the magnitude of that change is:
[tex]|b| = \sqrt{(-3)^2 +(4)^2+(-7)^2}[/tex]
[tex]|b| = \sqrt{9+16+49}[/tex]
[tex]|b| = \sqrt{74}[/tex]
[tex]|b| =8.6 \ mg/mL[/tex]
Hence, for both Lake A and B, the magnitude of change is the same.
Hot summers and cold winters, topsoil rich in organic material, annual precipitation of 75 to 125 cm (30-50 in), and many hardwood trees are characteristics of the:
Complete question:
Hot summers and cold winters, topsoil rich in organic material, annual precipitation of 75 to 125 cm (30-50 in), and many hardwood trees are characteristics of the:
A. temperate deciduous forest.
B. temperate grassland.
C. temperate rain forest.
D. boreal forest.
E. chaparral.
Answer:
A. temperate deciduous forest
Explanation:
Temperate deciduous forest
Temperate deciduous forest is one of the biomes that extends to the south of the boreal forest, expanding in regions where temperatures are not that cold, and precipitations are abundant. The temperate forest is not continuous, it extends between 30º and 60º latitude in both hemispheres, and along with the continental extremes, influenced by the oceans. Vegetation suffers changes through the four seasons, which are clearly differentiated. Temperate forest characterizes for having deciduous trees among other phanerophyte species. Due to environmental conditions, these plants need to lose their leaves every year during the cold and dry autumns and winters, as it is the most limiting period over the year. They need to store different nutrients that will be used for plant growth during the following spring. Foliage reappears again during spring and summer.
Winters are cold and summers are warm. Precipitations are abundant, between 750 and 1500 annual mm, and they are well distributed during the year. Usually, there is a small water deficit at the end of the summer, while during the spring there is water excedent in the ground. Soils are very fertile and deep, due to the leaves´ loss that provides nutrients to the soil and protects it from erosion.
PLS HELP FAST NO LINKS!
What is formed because the Sun heats some areas of the earth more than others?
A.precipitation
B.clouds
C.air fronts
D.air pressure
Describe the processes that turn metamorphic rock into igneous rock and the energy that powers the processes.
So, we know that a metamorphic rock is either an igneous or a sedimentary rock that are exposed to intense heat and pressure.
But when the metamorphic rock is thrusted deep underground through subduction, it will again be subjected to intense heat. This can cause it to melt, turning it into a magma. When the magma cools down, it again becomes an igneous rock and the rock cycle continues.
Science- bbbbbbbbbbbbb
Answer:
table
Explanation:
Why consist of a cell body that contains the 
Answer:
The cell body, also called the soma, is the spherical part of the neuron that contains the nucleus. The cell body connects to the dendrites, which bring information to the neuron, and the axon, which sends information to other neuron
Explanation:
Mark brainliest pls
An example of a parallel choice on a dichotomous key is
Answer:
brown hair or black hair.
Identify the organelle that packages and secretes proteins and membrane parts
A. Nucleus
B. Mitochondria
C. Golgi Apparatus
D. Cell Membrane
Which non-renewable source of energy does the world use the most?
Answer:
Renewable energy comes from sources that will never deplete, no matter how much is used. An example of this is wind energy, which had been growing in popularity in countries like India and Germany. Nonrenewable energy makes up 85% the energy used on earth—the most popular form of energy being oil.
What floats into rivers then into the ocean that causes the most ocean pollution?
Answer:
trash and junk
PLS HELP
During which phase of meiosis does crossing over occur?
A. Interphase
B. Prophase 1
C. Metaphase 1
D. Anaphase 1
E. Telophase 1
Answer:
prophase 1
Explanation:
the complex that temporaily forms between homologous chromosomes is only present in prophase 1, making this the only opportunity the cell has to move dna segments between the homologous pair.
5. What do Chloroplast and Mitochondria have in common?
A. They contain DNA
B. Provide energy to the cell
C. Are in charge in cell transport
D. Make proteins
Answer:
B. Provide energy to the cellExplanation:
Both the chloroplast and the mitochondrion are organelles found in the cells of plants, but only mitochondria are found in animal cells.
The function of chloroplasts and mitochondria is to generate energy for the cells in which they live.
The structure of both organelle types includes an inner and an outer membrane
In humans, hemophilia is a sex-linked recessive trait. If a male who has hemophilia marries a female with
normal blood clotting, what percent of the males will have the disease
A- 0 males= 0% of the males
B- 1 male= 50% of the males
C- 2 males= 100% of the males
D- 3 males= 100% of the males
C- 2 males. 100% of males. I don't know but try using a punnet square to figure it out yourself :)
Which of the following is not a contribution of Gregor Mendel to the field of genetics?
A. Discovering Natural Selection
B.Identifying dominant and recessive traits
C. Making genetic predictions
Answer:
its c
Explanation:
Kudzu, a vine native to Asia, was introduced into the USA in 1876. Farmers in the South were encouraged to plant kudzu to reduce soil erosion. Once established in its new habitat kudzu can grow as fast as a foot a day!
Which of the following is likely NOT true about the impact of kudzu in the South?
a
Kudzu has the potential to overtake and replace native plants
b
Increase the biodiversity of the ecosystem in the South
c
Alter the nitrogen balance of the soil
d
Have long term impacts on the local organism populations
Answer:
hi what did you get for this one?
Explanation:
The statement which is not true about the impact of kudzu in the South is that it has long-term impacts on the local organism populations. Thus, the correct option for this question is D.
What is Habitat?Habitat may be defined as a type of natural environment for which a particular species is best adapted due to natural selection. It is generally an area or place where all the basic demands of an organism are fulfilled like food, space, mating partner, resources, etc.
According to the context of this question, the farmers in the south were encouraged to plant kudzu to reduce soil erosion. This means that it has the ability to increase the biodiversity of the ecosystem in the South.
Apart from this, it also has the potential to overtake and replace native plants. It also alters the nitrogen balance of the soil. But it does not express long-term impacts on the local organism populations.
Therefore, the statement which is not true about the impact of kudzu in the South is that it has long-term impacts on the local organism populations. Thus, the correct option for this question is D.
To learn more about Habitat, refer to the link:
https://brainly.com/question/728057
#SPJ6
Which of these is not a characteristic of living things?
All living things are made up of cells.
All living things are based on a universal genetic code.
All living things move.
O All living things grow and develop.
Answer:
Not all living things move
Explanation:
Trees dont move and they are living plants.
Computer simulations are __________ ?
1) Dry lab
2) In-silico
3) In-vitro
4) Wet lab
Answer:
2) In-silico
Explanation:
Hope it helps!
Is human reproduction controlled by the nervous system? True or false.
Answer:
True.
Explanation:
Research has found that chimpanzees in one area make spears to help them hunt bushbabies (African lorises). The chimpanzees locate a tree trunk in which the bushbabies live. They then select a tree branch, trim off the leaves and side branches, and trim the end of the branch to form a sharpened tip. The chimpanzees thrust these branches, like spears, into the tree to try to stab bushbabies (see the Lab 11 Exercise Image Library on p. 336 of your lab manual for associated images).
Is this behavior an example of nonhuman primate culture?
1. Yes
2. No
Primates often work together while hunting and then share the meat with others in the group.
1. True
2. False
Answer:
1. Yes
1. True
Explanation:
A.
Yes, it is a nonhuman primate cultural example: Despite the fact that many nonhuman primates lack apparent cultural traditions in the same manner that humans do, primatologists have uncovered a number of behavioral habits that differ between populations and are passed down through socialization and language interaction. The employment of tools by chimps for hunting is one of the most prominent examples of this. Chimpanzees in the African Savannah have been observed fashioning sticks into weapons to hunt bush infants, according to researchers. In each example, a chimp changes a branch by snapping off one or two ends and sharpening the stick with its teeth. The spear is then jabbed into the bottom of the trunk, where the bush infants slumber. Because this complicated behavior appears to differ between communities, it is thought that chimpanzee tool usage is socially acquired, and hence a cultural behavior.
B.
Chimpanzees hunt in groups so that they may corner their prey even if the canopy is continuous. Each chimpanzee within the hunting parties has a specific function to play during an arboreal hunt. Drivers are responsible for keeping the prey moving in a specific route and following them without trying to grab or catch them. Blockers are positioned at the base of the trees, climbing up to stop prey from fleeing in the other direction. Chasers move swiftly and attempt to capture the prey. Finally, when one monkey approaches, ambushers hide and flee. The food is delivered to all members of the hunting group once the animal has been trapped and slaughtered.
Both microscopy and motility agar are used to confirm microbial mobility. Research techniques involving microscopic determination of mobility and explain why both microscopy and motility agar are required to determine motility in some microbes.
Answer:
One allows microbe to move in the medium and the other allows to see it.
Explanation:
Both microscopy and motility agar are required to determine motility in some microbes because both substances helps to find out the mobility in the microbes. Motility agar is the medium that allows microbes to swim if they have flagella in their body while on the other hand, microscope is used to see the movement of microbes in motility agar. Microbes are small creature which can't be seen through naked eyes so we used microscope for it.
This body system sends impulses to all parts of the body; controls breathing and heart
rate for example.
A. Endocrine
B. Nervous
C. Excretory
D. Immune
Answer:
D
Explanation:
Drag two black mice into the Parent 1 and Parent 2 boxes. Click Breed to view the five offspring of these parents. What do the offspring look like
Answer:
The correct answer is - All offsprings are black-furred mice.
Explanation:
In this case, the parent mice are black and a cross between these mice produces offspring one allele from both parents. Here, black fur is dominant over white fur.
All the babies are with dark fur colors, no whites as black is a dominant color, so it produces black due to cross between two true breeds.
B B
B BB BB
B BB BB
Question 9 (1 point)
The producers that live in the abyssal zone are chemosynthetic because this zone has no what
Answer:
No sunlight penetrates the Abyssal zone.
Explanation:
I did this on my study guide a while back and got an A for it.
Jade looks at the flowerpot in her classroom and notices that it looks wilted. Which of the following actions could be taken to help the wilting flower?
A. put it in direct sunlight
B. prop it up with toothpicks
C. throw it away
D. pour water into the pot
Which endorcrine gland is indicated by the arrow?
sorry by mistake
pls delete my answer
A ____ farm can be used to generate electricity. a. sheep c. wind b. wheat d. fish
Answer:
The answer is pretty much C. wind
1. Most organisms have only one cell.
True or false
Answer:
True
Explanation:
Hope this helps!! :)
An opportunistic predator switches prey, capturing whichever prey species is most abundant. As soon as the prey numbers dwindle and another species becomes more abundant, the predator will consume the more abundant species. In doing so, this predator maintains great biodiversity in the community. This type of predator is called a
Answer:
The correct answer is keystone predator.
Explanation:
In sustaining the composition of an ecological community, a keystone species plays an essential function. In the absence of keystone species, the ecosystem would fail to exist and would become drastically different. A predator is a classic illustration of a predator, which inhibits a specific herbivorous species from eradicating the dominant species of plants. In the non-existence of predators, the herbivorous prey would increase enormously and would clean the entire essential plant species, and thus, drastically change the significance of the ecosystem.
Changes in ecosystems are most pronounced when humans remove which species?
Answer:
Of course predators consume prey, but in doing so, they may have broader impacts on communities as a whole. That is to say, predators help to maintain a balance among organisms, both by consuming prey and by altering prey behavior and prey habitat selection. This article describes how predators influence the composition and distribution of species in communities.
Explanation:
A body is negatively charged when________
1) It has lost neutrons
2) It has gained extra electrons
3) It has lost electrons
4) It has gained protons
Answer:
2.it has gained extra electron
Answer:
no 3 it has lost electrons