Animal Crossoword

2. Vascular System a system of canals in echinoderms containing a circulating watery fluid that is used for the movement of the tentacles and tube feet.
5. a ridgid external covering for the body in some invertebrate animals, especially arthropods, providing both support and protection.
10. a flattened circular organ in the uterus of pregnant eutherian mammals, nourishing and maintaining the fetus through the umbilical cord.
11. an internal skeleton,such as the bony or cartilaginous skeleton of vertebrates.
13. The hollow, columnar, sessile form of Cnidarians
14. bladder is an internal gas-filled organ that contributes to the ability of many bony fish to control their buoyancy, and thus to stay at their current water depth without having to expand energy in swimming.
16. are similar.
17. Having a backbone.
18. two parts of something are not exactly the same
21. the condition of having both male and female reproductive organs.
22. Eggs An air breathing egg chracterized by a shell and extraembryonic membranes.

1. the arrangement of body parts around a central axis.
3. dependent on or capable of the internal generation of heat.
4. a tough elastic tissue composing most of the embryonic skeleton of vertebrates.
6. the assemblage of organisms inhabiting the seafloor.
7. an organism that regulates its internal temeprature by exchanging heat with its surrounding environment.
8. a form of asexual reproduction in which a new individual develops from some generative anatomical point of the parent organism.
9. a form of symmetry in which the opposite
12. The freely-swimming,umbrella- or disk shaped gelatinous form of Cnidarians.
15. an animal lacking a backbone
19. (of an animal) shed old feathers, hair, or skin, or an old shell, to make way for new growth.
20. glands Glandular organ located on the chest