Answer:
B. vegetation
Explanation:
vegetation is plants
biotic means living
plants are living
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Both plant and animal cells have mitochondria
The central nervous system (CNS) consists of the brain, spinal cord, and optic nerves. The peripheral nervous system (PNS) consists of the nerves that branch off the spinal cord and innervate the rest of the body.
Answer:
Explanation:
our solar system formed about 4.5 billion years ago from a dense cloud of interstellar gas and dust. The cloud collapsed, possibly due to the shockwave of a nearby exploding star, called a supernova. When this dust cloud collapsed, it formed a solar nebula—a spinning, swirling disk of material.
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Answer:
The correct answer is D. proliferation and differentiation.
Explanation:
Primary immune response occurs due to the first exposure of an antigen to the immune system. The primary immune response is generally delayed by many days because it takes time for B and T cells to become cloned and to proliferate and differentiate.
Then after several days of proliferation and differentiation of activated T and B cells, T cells become effector T cells and B cell becomes plasma cells which then eliminates the antigen. Memory B and T cells are also produced during this process which helps in generating a quick immune response during the second and subsequent exposure of that antigen.
So the correct answer is D. proliferation and differentiation.