Simple Invertebrates

5. are parasites; has a small head, no eyespots, suckers help to adhere to host
8. has bilateral symmetry, 3 embryonic layers, a simple nervous system, and eyespots
9. Organisms with both male and female reproductive organs
10. free-living freshwater, marine, or terrestrial in damp places
12. 2 embryonic tissue layers; has radial symmetry; can be in the form of a polyp or medusa
14. harpoon-like structure in the cnidocyte
15. no body cavity
16. a body cavity completely lined with mesoderm, filled with fluid

1. stinging cell
2. grouping of nerve cells that controls a part of the body
3. Has no nervous system, no tissue
4. non-motile cnidarian body plan
6. A body cavity partially lined with mesoderm, not a true body cavity
7. Cells that use flagella to move water
11. Bilateral symmetry, 3 embryonic tissue layers,simple nervous system with ganglia, pseudocoelomate, one-way digestive tract
13. bell-shaped body and tentacles