*Question*
Q: What is the study of energy and how it interacts with matter? Choices: - quantum mechanics - cosmology - kinetics - physics A:
**Answer**
physics

*Question*
Q: What type of species have a large effect on the balance of organisms in an ecosystem? Choices: - decomposers - producers - secondary consumers - keystone A:
**Answer**
keystone

*Question*
Q: What kind of gland produces an oily substance that waterproofs the hair and skin? Choices: - secretion gland - nail gland - mucous gland - sebaceous gland A:
**Answer**
sebaceous gland

*Question*
Q: The skin plays an important role in preventing the escape of what commonly found liquid from the body? Choices: - hormones - stomach acid - urine - water A:
**Answer**
water