| A | B |
|---|
| cell | basic building block of all organisms |
| consumer | an organism that cannot make its own food; they eat other organisms |
| development | the way a living thing changes during its life |
| endangered species | a group of living things in which there are very few that are living; they are in danger of becoming extinct |
| experiment | a test to discover something, usually using the scientific method |
| extinct | when all of an organism is gone from Earth forever |
| fossil | a footprint, skeleton, or other remains of something that was once living |
| grow | to become larger by a natural process of development |
| hypothesis | an explanation, or guess, based on something that is already known |
| organism | a living thing |
| oxygen | a colorless, odorless, tasteless gas found in air and water; it is needed by all living things |
| producer | an organism that makes its own food |
| record | to write down observations in an experiment so they can be used later |
| reproduce | to make new living things of the same kind |
| resource | materials from Earth that people use |
| scientific method | a way scientists solve problems |
| response | something a living thing does when its environment changes |
