(Question)
Q: Compounds that form from two or more nonmetallic elements are called what? Choices: - ionic bonds - valent bonds - hydrogen bonds - covalent bonds A:
(Answer)
covalent bonds

(Question)
Q: What is the primary cause of air movement in the troposphere? Choices: - solar winds - asteroids - the ozone layer - differences in heating A:
(Answer)
differences in heating

(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