(Question)
Answer the following question given this paragraph: Many teens have emotional ups and downs. This is at least partly due to their changing hormone levels. Q: Changing levels of what substances partly explain emotional ups and downs in teens? Choices: - nutrients - acids - enzymes - hormones A:
(Answer)
hormones

(Question)
Answer the following question given this paragraph: Annelids called polychaete worms live on the ocean floor. They may be filter feeders, predators, or scavengers. The amazing feather duster worm in Figure below is a polychaete that has a fan-like crown of tentacles for filter feeding. Q: Where do polychaete worms live? Choices: - in tide pools - attached to marine life - in coral reefs - the ocean floor A:
(Answer)
the ocean floor

(Question)
Answer the following question given this paragraph: Q: What process consists of the mechanisms that produce an observed pattern of change? Choices: - repetition - variation - cycle - evolution A:
(Answer)
evolution