| A | B |
|---|
| an individual living thing | organism |
| a group of various species that live in the same place and interact with each other | community |
| living or once living part of an ecosystem | biotic factor |
| unequal survival and reproduction that results from the presence or absence of particular traits | natural selection |
| all the organisms living in an area and their physical envirionment | ecosystem |
| change in the genetic characteristics of a population from one generation to the next | evolution |
| all the members of the same species that live in the same place at the same time | population |
| nonliving part of the ecosystem | abiotic factor |
| ability of one or more organisms to tolerate a particular chemical designed to kill it | resistance |
| group of organisms that are closely related and that can mate to produce fertile offspring | species |
| place where an organism lives | habitat |
| Humans breed plants or animals with specific characteristics | artificial selection |
| single-celled and many-celled organisms that may be plant-like, animal-like, or fungus-like | protists |
| many-celled ortganisms that must ingest food and whose cells have no cell wall | animals |
| single-celled organisms that lack nuclei | bacteria |
| many-celled organisms that have cell walls and make their own food | plants |
| organisms whose cells have nuclei and cell walls, but no chlorophyll | fungi |
