| A | B |
|---|
| Bacteria | Microscopic, prokaryote |
| Virus | Disease causing, non-living particle composed of nucleic acid and protein coat |
| Host cell | Cell in which a virus reproduces |
| T-cell | Immune system cell which is the host to HIV virus |
| Natural selection | Mechanism that explains ho changes in populations occur when organism with favorable variations survive, reproduce and pass on genes |
| Adaptations | Evolution of structural, internal or behavioral features that help an organism better survive in its environment |
| Homologous structures | Structures that have different mature forms in different organisms but develop from the same embryonic tissue, ex. Human arm, bird wing |
| Ecosystem | Populations in a community and abiotic factors with which they interact |
| Food chain | A possible route for the transfer of matter and energy through an ecosystem |
| Food pyramid | Summarizes interactions of matter and energy at each trophic level |
| Producers | Organisms that produce energy (plants) |
| Consumers | Organisms that get energy by eating other organisms |
| Autotroph | Organism that can capture energy from sunlight or chemicals and use it to produce its own food from inorganic compounds |
| Food web | Shows all the possible feeding relationships in a community |
| Predation | A mode of life in which food is obtained by killing and consuming animals |
| Commensualism | Symbiotic relationship in which one species benefits and the other is neither harmed nor helped |
| Mutualism | Symbiotic relationship beneficial to both species |
| Parasitism | Symbiotic relationship in which one species benefits at the expense of the other |
