Answer: B)heavy-chain constant segments
Explanation:
The immunoglobulin are the antibodies that are found in the serum. There are five classes of these antibodies in the serum. These includes the IgG, IgD, IgA, IgM and IgE. They are classified on the basis of difference in the type of heavy chain. IgG, IgA, IgE, IgD contains μ, α, ε-, and δ- heavy chains respectively.
This variation helps each immunoglobulin class to generate a different kind of immune response during different stages of body defense.
Terminal buttons.
Explanation:
Neurons are longest animal cell that serve as the basic unit of their nervous system.
The neuron is divided into two parts-
Cyton: It is the cell body of the neuron. It has projection extending from the cytoplasm that receive signals called dendrites.
Axon: It is a long process extending from the cyton that carries the impulse from cell body to end of neuron. The axon terminate at knob like structures called terminal button . These release neurotransmitter and are rich in mitochondria.
C. endospore
Endospore: a resistant asexual spore that develops inside some bacteria cells.
Your answer is D A kitten gains weight because they are similar because there both growing rather in height or weight because there both growing also its not A because that's an characteristic of a octopus is that it can camouflage with the floor and its not similar because it isn't growing in any way its also not B because a giraffe is eating a leaf off a tree is another example of a characteristic because of the giraffes long neck but its not growing in any way again its also not C because when a bee stings you your arm will swell up yes that's growing but it will soon go down and when it came down to rather D, or E I choose D because that's because its a sign of love or characteristic of a butterfly that's it removes pollen from its mate that's why I have chosen C. Your answer is C.