Changes in Ecosystems

Match it! Select the correct answer from the pull down...Good luck!

A species that is in danger of becoming extinct is a(n) ______________.

Weeds, then shrubs, and finally ___________________ grow.

The first organisms to live in the area are called ________________ species.

When land is burned by a fire, or a farm field is abandoned, ________________ occurs.

The establishment of a new community where a community had already existed is called ___________.

New ____________________ begin to grow in the soil.

The process of one ecosystem gradually changing into a different type of ecosystem is called _____________.

Ecosystems change over time. People cause some of the changes, through pollution, __________________ destruction, or hunting, or by introducing or removing ______________.