Macrophages are cells that play a role in the response of the immune system of mice and other mammals to invasive organisms such as bacteria. unlike other mice, mice that are genetically incapable of making these particular cells do not show elevated levels of nitrates when infected with bacteria. the statements above, if true, provide the most support for which of the following conclusions?
(a) mice that are unable either to make macrophages or to make them in sufficient numbers will protect themselves from bacterial infections in some other way.(b) mice that show elevated levels of nitrates can easily fight off most types of bacterial infections.(c) in mice, macrophages play a role in the production of nitrates or inhibit a process by which nitrates are broken down or otherwise eliminated.(d) when a healthy mouse becomes infected with an invasive organism, the number of macrophages in the mouse’s body decreases.(e) injections of nitrates into mice that lack macrophages will not enhance the ability of these animals’ immune systems to fight off infection.

A - Mice that are unable to make macrophages or to make them in sufficient numbers will protect themselves from bacterial infections in some other way

Explanation:

The statement inferred that macrophages play a role in  the immune system of mice and since elevated nitrate levels is an indicator of bacterial infection, the fact that the mice do not show elevated nitrate level means that they must be fighting the bacterial infection in some other way which makes A the only logical conclusion.

B is unacceptable as the mice do not show elevated nitrate levels.

C is far fetched because it talks about the production of nitrates by macrophages while the statement inferred elevated nitrate as a result of bacterial infection.

D is false because it talks about mice able to produce macrophages and E is also wrong because it talks about injection of nitrates into mice which is not related to the statement

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genetic variation can be caused by mutation (which can create entirely new alleles in a population), random mating, random fertilization, and recombination between homologous chromosomes during meiosis (which reshuffles alleles within an organism's offspring).