Q: In boys, what hormone stimulates the growth of the larynx and thickening and lengthening of the vocal folds, which causes the voice to drop in pitch during puberty? Choices: - Sexual - Endocrine - Petuitary - testosterone A:
testosterone

Q: Clams, oysters, scallops, and mussels are examples of what type of species? Choices: - mammals - invertebrates - tortoises - mollusks A:
mollusks

Q: Water pollution occurs when chemicals, sewage, trash, or heat enter what? Choices: - renewable resources - air resources - natural resources - water resources A:
water resources