Science III

2. The mineral needed for the transport of oxygen in the blood is ?.
5. — An animal that eats both plants and animals is a(n) ?.
12. Mammals whose young develop in a uterus or womb are ? mammals.
14. A lack of proper nutrition due to a poor diet is called ?.
17. The only mammals that can actually fly are ?.
18. The central nervous system contains the ?.
19. The hormones that control various internal body functions are released by the ? system.
20. Bats are able to find their insect prey using their ? system.
21. A strong feeling expressed in a physical way is a(n) ?.
22. A factor that is observed to determine the results of an experiment is a(n) ? variable.
23. For protection and dispersal, angiosperm seeds are enclosed inside a structure called a ?.
24. The slow-moving arboreal xenarthran with large claws is the ?.

1. An internal skeleton is a(n) ?.
3. The general name for animals that chew cud is ?.
4. A sudden, permanent change in an organism's DNA is a(n) ?.
6. The thin, sticky film of bacteria that forms on teeth is called ?.
7. The lower chambers of the human heart, which pump blood to other parts of the body, are called ?.
8. Legumes, which help restore nitrogen into the soil, are members of the ? family.
9. The group of nutrients that includes sugars and starches is the ?.
10. The place within the environment where an organism lives is its ?.
11. The large vessels that carry blood back to the heart are called the ?.
13. An animal with a backbone is a(n) ?.
15. The organ that produces bile, filters certain poisonous substances from the blood, and stores excess blood glucose is the ?.
16. Because they do not eat plants, the only group of mammals considered truly carnivorous are the ?.