100 POINTS AND BRAINLIEST Index fossils give us clues to?

Fossils tell us a lot about the environment during the time they were deposited. Fossils can indicate something as important as the weather. This is because organisms live under specific conditions. An index fossil must be distinctive, abundant, and short-lived.

Explanation:

when a reversible reaction is occurring in both directions at the same rate; the products and reactants do not change in concentration. a chemical reaction where the compound is broken into its constituent parts.

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