Animal crossword

3. anything associated with or occurring on the bottom of a body of water
4. located in the body cavity and is derived from an outpocketing of the digestive tube
5. lack of equality or equivalence between parts or aspects of something; lack of symmetry.
6. any so-called cold-blooded animal
9. a system of vessels in echinoderms containing a circulating watery fluid that is used especially for the movement of tentacles and tube feet.
10. terrestrially adapted egg, characterized by a shell and extra-embryonic membranes
13. an asexual reproduction method in which a new organism develops from a bud of an existing organism
14. an organ that connects the developing fetus to the uterine wall, thereby allowing nutrient uptake, waste elimination, and gas exchange via the mother's blood supply
17. milk producing gland of female mammals
18. a skeleton that is on the inside of a body, like humans, dogs, or some fish.

1. an animals lacking a backbone, such as an arthropod, mollusk, annelid, coelenterate, etc lack of equality or equivalence between parts or aspects of something; lack of symmetry.
2. warm-blooded animals
7. a non-vascular type of supporting connective tissue that is found throughout the body
8. a hard covering that supports and protects the bodies of some types of animals.
11. one of two principal body types occurring in members of the invertebrate animal phylum Cnidaria
12. the property of being divisible into symmetrical halves on either side of a unique plane.
15. symmetry around a central axis, as in a starfish or a tulip flower
16. a projecting mass of swollen and hypertrophied or tumorous membrane