| A | B |
|---|
| bilateral symmetry | divides in two halves, mirror image |
| radial symmetry | divides into many parts, several lines of symmetry |
| sponges | have no internal organs, can regenerate |
| cnidarians | use both sexual and asexual reproduction |
| colonies | where cnidarians live together in groups |
| symbiosis | close relationship between two species |
| mutualism | both animals benefit |
| commensalism | one animal benefits |
| parasitism | one animal lives off another |
| succession | growth process of ecosystems |
| pioneer species | starting organisms from another place |
| climax community | same organisms live on land for a long time |
| producers | make energy from environment |
| consumers | eat to get energy |
| decomposers | break down dead into original chemicals |
| food webs | describe interactions between organisms in an ecosystem |
| adaptations | behavior or physical characteristics that allow organisms to successfully live in their environment |
| niche | role of organism in its habitat |
| competition | two species compete for survival in habitat |
| predation | one organism kills another for food |
| predator | adapt to better kill prey |
| prey | adapt to better escape predator |
