Animal Crossword

2. cold-blooded animals
3. an organism having both male and female reproductive organs
4. one of two principal body types occurring in members of the invertebrate animal phylum Cnidaria
5. a system of vessels in echinoderms containing a circulating watery fluid that is used especially for the movement of tentacles and tube feet
7. a form of symmetry in which the opposite sides are similar
8. lack of symmetry
9. a non-vascular type of supporting connective tissue that is found throughout the body
13. located in the body cavity and is derived from an outpocketing of the digestive tube
15. a projecting growth of tissue from a surface in the body, usually a mucous membrane
16. an organ that develops in the uterus during pregnancy
18. warm-blooded animals
20. bony or cartilaginous skeleton of vertebrates

1. animals lacking a backbone
4. the shedding or casting off of an outer layer or covering and the formation of its replacement
6. animals with a backbone
10. a terrestrially adapted egg, characterized by a shell and extra-embryonic membranes
11. a hard covering that supports and protects the bodies of some types of animals
12. a highly evolved and specialized organ present in pairs, one on each side of the anterior chest wall
14. type of structure of an organism or part of an organism in which a vertical cut through the axis
17. a form of asexual reproduction in which a new is formed from a bud of an existing organism
19. leaving near the seafloor