| A | B |
|---|
| stable | balanced as in an ecosystem |
| succession | process by which one community is replaced by another until a stable community occupies the area.This process happens very slowly. |
| ice melted,formed ponds, moss & lichens broke rocks to make soil,wind scattered seeds for plants to grow,animals were attracted because of plants,over time plants& animals died and filled in the pond, it became a marsh, a meadow and then a forest | example of succession (in order) |
| added nutrients as things grow and die | allows more and more organisms to live in an ecosystem |
| hurricanes, tornados, thunderstorms,forest fires, and actions done by humans | events that can cause an ecosystem to change rapidly |
| destroy habitats, cause forest fires, overhunt, litter and pollute the homes of living | ways humans have a negative impact on an ecosystem |
| laws that protect animals and their habitats from being destroyed,when building,provide new habitats;make laws to stop overhunting and limit pollution | ways humans have a positive impact on an ecosystem |
| find a new habitat that meets their needs or they disappear | happens to the organisms when their habitats are changed |
