Explain how the geologist knows the relative age of intrusion compared with that of the gravel

carbon 14

Explanation:they use it to know the age police use it too

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

when it is at an intermediate population density