Animal Kingdom

4. An external skeleton that protects and supports the animal.
8. Animals that typically maintain an internal body temperature higher than their environment.
9. Refers to the front or lower side of an organism.
12. Refers to the back or upper side of an organism.
14. An animal lacking a backbone and spinal column.
15. The property of being divided in symmetrical arrangements around a single main axis.
16. An animal that has a spinal column and a backbone.
18. Digestive system with only one opening, therefore the waste comes out the same opening that the food goes in.
19. Refers to the front of a body.
20. Refers to the back of a body.

1. The property of being divisible symmetrically on either side of a unique plane.
2. A system where blood leaves the heart then travels in a closed circuit circle then re-enters the heart.
3. Refers to the outer side of a body part and also used to refer to the side of a body part.
4. An internal skeleton.
5. An evolutionary development in which, over time, the mouth, nerve ganglia, and sense organs, become concentrated at the front end of an animal, producing a head and brain.
6. Animals that have a body temperature that varies with the temperature of their environment.
7. Digestive system with two openings, therefore the waste goes out one opening and the food goes in a separate opening.
10. An animal or person with both female and male sexual organs or other sexual characteristics.
11. The absence or lack of symmetry.
13. A system where blood leaves the heart through open-ended vessels and passively flows back to the heart.
17. An organism that is predominantly immobile and lacks the ability of self-locomotion.