large geographic areas that have similar

climates and ecosystems

an organism that can make its own food (through photosynthesis)

a living thing

Different populations of organisms that live in the same area

This is an ecosystem with many trees.

The number of different species of plants and

animals in an area

A system comprising all the biotic and abiotic

factors in an area and all the interactions

among them

The series of predictable changes to the environment that takes place over a long period of time.

The organism that arrives first to a newly created environment is known as a-

This pioneer species is the first to arrive that helps break apart rocks to help make soil.