Invertberate

2. An organism whose body temperature is largely determined by heat exchange with its surroundings
3. a sexually reproducing organism that produces both male and female gametes.
4. free swimming and sexual
5. a network of water vessels in the body
7. the property of being divisible into symmetrical halves on either side of a unique plane.
8. Lack of equality
9. flexible connective tissue found in various forms
13. organ in fish that plays roles in buoyancy
15. lives sessile and is asexual
16. a flattened circular organ in the uterus of pregnant eutherian mammals
18. dependent on or capable of the internal generation of heat.
20. internal frameworks of bones and cartilage found in vertebrates like humans

1. The largest group of animal species, encompassing an enormous array of terrestrial and aquatic wildlife
4. old shed skin
6. having a backbone inside the body
10. covered with a protective leathery shell
11. protective covering
12. organ located on the chest
14. that can be divided into two matching halves by many different lines
17. A form of asexually reproduction
19. anything associated with or occurring on the bottom of a body of water.