The chromosome structure in a cell accounts for
genetic variation based on the order of its
a. sugar groups
b. nitrogen bases
c. hydrogen bonds
d. phosphate groups

some fungi obtain their nutrients from a living host (plant or animal) and are called most biotrophic fungi have fairly narrow host ranges—they are specialized on a limited called rhizomorphs that allow the fungus to grow from one tree to another. ascospores are formed inside a sac-like structure called an ascus. so your answer is a

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it's c.us forest service