| A | B |
|---|
| drought | A long period of dry wether. |
| ecosystem | A system of living things,all the nonliving things that surround it,and the relationship between them. |
| environment | Evrything that surround and influences an organism. |
| environmental factor | One part of the environment.An environmental factor can be nonliving,such as water,light,tempeture,or chemicals,or living,such as a plant or an animal. |
| enzyme | A complex protain that acts to change the speeds of chemical reactions. |
| expel | To force out. |
| food chain | A description of feeding sequences of one set of organisms in an ecosystem,such as grass seeds,chipmunk,and hawk. |
| food web | A desription of the feeding realationships between all of the organisms in an ecosystem. |
| fungus | An organism that lacks chlorophyll and absorbs nutrients from dead or living organisims. |
| genetics | A branch of biology that studies inherited traits. |
| germinate | When a seed sprouts,or start to grow and develop. |
| glacier | A large mass of ice moving down a mountain or along a valley. |
| herbivore | An animal that eats plants. |
| host | A living organism on which a parasite lives. |
| immunity | The capacity to resist chemical toxins. |
| indicator | A chemical used to test for the presence,absence,or amount of a substance in a material. |
| invertebrate | Without a backbone. |
| irrigate | To water crops by artifical means. |
| isopod | A small crustacean with 14 legs that all function the same. |
| kelp | A brown seaweed.A type of algae. |
