Across
- 1. Tough sponge fiber is a protein, but it is very hard, like glass.
- 2. a body cavity lined with tissue called a peritoneum.
- 4. capsules that house dischargeable tubular threads
- 5. guts have one opening for taking in food and expelling residue.
- 8. encloses organs and helps hold them in place
- 9. skeleton: a fluid filled cavity against which contractile cells can act
- 11. groups of animals
- 12. symmetry: body parts arranged regularly around a
- 14. symmetry: a right half and left half are mirror images of each other.
- 15. axis, like spokes of a bike wheel.
- 16. Humans have a coelom divided by a muscle called a _____________
- 20. animals have a repeating series of body units.
- 22. produced in gonads, which Obelia releases by rupturing.
- 24. outer tissue layer
Down
- 1. animals with no symmetry, tissues or organs
- 3. have a backbone
- 6. a microscopic, swimming, immature stage of a sponge
- 7. has a free surface that faces the environment or some type of fluid inside the body
- 10. tentacle, radial animals. group of invertebrates that includes jellyfish, corals, sea anemones, and hydras
- 11. have a tube like body with a tentacle-fringed mouth at one end. Usually the other end is attached to a substrate.
- 13. opposite, The ventral surface.
- 17. clusters of sponge cells
- 18. meaning middle jelly
- 19. inherit pairs of chromosomes.
- 20. the surface on which a plant or animal lives
- 21. a tubular or sac like region in the body where food is digested
- 23. the sexual stage of the life cycle of the obelia