Help with some biology work please?

Posted on 2015-10-16 05:55:00 in Biology by SIMON

Match the words below with the definitions.

______Protostomes whose defining characteristic is the mantle; many are filter feeders
____ Deuterostomes characterized by a cartilaginous endoskeleton
____ Deuterostomes that lay amniote eggs on dry land
___ Animals with alternating medusa and polyp stages in their life cycle
____ Deuterostomes with radial symmetry and a water vascular system
____ Segmented protostomes which exchange gases with the help of spiracles and tracheae
____ Many of these are parasitic and must absorb nutrients and exchange gases directly through the skin, having lost their ancestral digestive organs
____ Animals with no distinct cell layers and no true organs

1. Poriferans
2. Reptiles
3. Mollusks
4. Echinoderms
5. Cnidarians
6. Flatworms
7. Chondrichthyans
8. Insects

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