| A | B |
|---|
| blastula | hollow ball of cells |
| chordate characteristics | notochord, dorsal hollow nerve cord, pharyngeal slits & post-anal tail |
| spongin | soft protein that makes up the support for sponges |
| bilateral symmetry characteristic | cephalization, anterior, posterior, dorsal & ventral surfaces |
| endoderm | cells in blastula that will for the lining of the gut |
| ectoderm | tissue that will develop into nerves and skin |
| mesoderm | blastula tissue that will develop into muscles and bones |
| tissue | group of cells that have a specific function |
| radial symmetry | type of body plan that body parts are arraned around a center |
| diploid | cells that contain two sets of chromosomes |
| coelom | body cavity that allow for a space where interanl organs can develop and be protected |
| Mollusk examples | clams, snail, squid, octopi |
| Echinoderm examples | starfish, sea urchins, sea cucumbers - very spiny animals |
| Arthropod examples | insects, spiders, centipeds, crustaceans |
| Flatworms examples | planarians & tapeworms |
| Roundworm examples | Ascaris, hookworms, pin worms |
| Cnidaria examples | hydra, jellyfish, coral |
| parasite | an organism that lives off another organism as a free-loader and can harm the host |
| vertebrate examples | fish, amphibians, reptiles, birds and mammals |
