animal characteristics
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Created by:
mlmoody Plus on December 10, 2009
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20 terms
Terms | Definitions |
|---|---|
 protostomes | organisms where the mouth develops from the first opening or blastopore |
| invertebrates | animals without backbones |
| tissues | cells are organized into this |
| deuterostomes | organisms where the anus develops from the first opening and the mouth develops later from another opening |
| zygote | fertilized egg |
| budding | offspring develops as a growth on the body of the parent |
| fragmentation | parent breaks into pieces and each piece can develop into an adult animal |
| regeneration | new organism can regrow from a lost body parti if the part contains enough genetic info |
| parthenogenesis | female animal produces eggs that develop without being fertilized |
| blastula | fluid-filled ball of cells |
| gastrula | two-cell-layer sac with an opening at one end |
| asymmetry | irregular shape with no balance in body structure |
| radial symmetry | can be divided along any plane, through a central axis, into roughly equal halves |
| bilateral symmetry | can be divided into mirror image halves only along one plane through the central axis |
| anterior | head end of an animal |
| posterior | tail end of an animal |
| dorsal | backside of an animal |
| ventral | underside of an animal |
| coelom | body cavity that has tissue formed from the mesoderm |
| acoelomates | do not have a coelom |
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