HIV or Human Immunodeficiency Virus kills or damages the body's Immune system cells. The correct answer is option B. HIV specifically damages or kills the T-Helper Lymphocytes or T-cells, which are very important to the body's immune system. These cells are the cells that respond rapidly to infections.
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There are biotic factors which are living things or things that used to be living(fish, birds, etc), and abiotic factors which are things that are not alive and have never been alive(rocks, water, etc).
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They look like X's (X shape)
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The X shape are replicated chromosomes and are called the sister chromatids.
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It allows flexibility (adjustment) and survival of a population in the face of changing environmental circumstances.
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