Explain what population density means. its worth 100 points pls answer

Population density is the number of individuals per unit geographic area, for example, number per square meter, per hectare, or per square kilometer.

Explanation:

the trilobite is used as an index fossil for various geologic time periods as specific types of the trilobites were present in different geological time periods. they are a group of marine arthropods belonging to the class of trilobita.

explanation:

it's anything that aren't producers and consumers.

explanation:

you've got to be clear on what "this" is