| A | B |
|---|
| biotic factors | living factors in the environment |
| abiotic factors | nonliving factors in the environment |
| organism | a living thing |
| sexual reproduction | requires two parents |
| asexual reproduction | requires one parent |
| budding | form of asexual reproduction; forms buds |
| regeneration | example of asexual reproduction; new organism formed from part of organism |
| binary fission | form of asexual reproduction; a cell splits into two organisms |
| sperm | male sex cell |
| egg | female sex cell |
| zygote | single cell formed by fertilization |
| fertilization | process that joins the sperm and egg |
| internal fertilization | joining of sperm and egg inside the body |
| external fertilization | joining of sperm and egg outside the body |
| adaptations | trait that helps an organism survive |
| behavioral adaptations | the way an organism acts helps it survive |
| structural adaptations | body structures that helps an organism survive |
| grow | increase in size |
| development | changes an organism goes through |
| cell | basic unit of all living things |
| unicellular | organism made up of 1 cell |
| multicellular | organism made up of 2 or more cells |
| Deoxyribonucleic acid | found in all cells; instructions for cells |
| tissues | cells working together |
| organ | tissues working together |
| organ system | organs working together |
| stimulus | anything that changes an organism's surroundings |
| response | reaction to a stimulus |
| homeostasis | process that occurs to maintain a stable internal environment |
| sweating | example of homeostasis |
| autotroph | organism that produces its own food |
| heterotroph | organism that consumes its food |
| photosynthesis | process that autotrophs use to make food |
| herbivore | consumer that eats only plants |
| carnivore | consumer that eats only meat |
| omnivore | consumer that eats plants and meat |
| scavenger | consumer that eats other dead organisms |
| Decomposers | organisms that break down other organisms |
