| A | B |
|---|
| animal survive | their needs are met in that environment |
| parasite | hurts one organism and helps another |
| food for the predator become sick and die | The number of predators would decrease |
| balanced ecosystem | producers makes what the animals need |
| disturbance in ecosystem | too many of one thing or destroying their habitat |
| animals competing for food | they hunt at different times of day and night |
| national parks | preserve nature's beauty; go see one |
| fast ecosystem change | earthquake; flood |
| competition | struggle between organisms to meet their needs |
| succession | one community gradually replacing another community |
| host | provides energy or an environment for another organism |
| extinct | dinosaurs; no living members of a species |
| hazardous waste | very harmful to organisms and the environment |
| flood causes | kills grass, animals die or move that eat grass, animals that eat those animals will die or move |
