The verb concentrate means “gather” or “collect.” The suffix -ion, used to form nouns, means “state” or “condition.” Use this information to define the noun concentration.

noun concentration means the process of People directing effort and attention in a particular thing.

Explanation:

forexample

he stressed the need for greater concentration on environment issues.

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