Animal crossword

5. any so-called cold-blooded animal
8. an animal that has a backbone
11. the lack of symmetry
15. milk-producing gland characteristic of all female mammals and present in a rudimentary and generally nonfunctional form in males
16. a form of asexual reproduction in which a new individual develops from some generative anatomical point of the parent organism
17. an organ that connects the developing fetus to the uterine wall,
18. animal without a backbone
19. a non-vascular type of supporting connective tissue that is found throughout the body
20. the internal skeleton or framework of the body of an animal

1. rigid or articulated envelope that supports and protects the soft tissues of certain animals
2. a system of canals in echinoderms containing a circulating watery fluid that is used for the movement of the tentacles and tube feet.
3. located in the body cavity and is derived from an outpocketing of the digestive tube
4. the assemblage of organisms inhabiting the seafloor
5. a chemical reaction that absorbs energy
6. the property of being divisible into symmetrical halves on either side of a unique plane.
7. the shedding or casting off of an outer layer or covering and the formation of its replacement
9. The hollow, columnar sessile form of Cnidarians
10. one of two principal body types occurring in members of the invertebrate animal phylum Cnidaria
12. the condition of having both male and female reproductive organs
13. An air-breathing egg characterized by a shell and extraembryonic membranes
14. symmetry around a central axis