The preserved remains or traces of organisms that once lived on Earth.

A measure of the amount of dissolved salts in a given amount of liquid

"A plant that lacks vascular tissue and true roots, stems, and leaves"

The amount of space something takes up, or can fit in it.

The entire sequence of stages in the life of an organism, from the adults of one generation to the adults of the next.

a complex behavior that is rigidly patterned throughout a species and is unlearned

A group of individuals that belong to the same species and live in the same area