(Q).
Q: What are a class of biochemical compounds that living things use to store energy? Choices: - hydrocarbons - proteins - calories - lipids A:
(A).
lipids

(Q).
Q: Billions of what inside the human digestive tract help us digest food, make vitamins and play other important roles? Choices: - neurons - viruses - red blood cells - bacteria A:
(A).
bacteria

(Q).
Q: The golgi apparatus works like a mail room by receiving and sending what? Choices: - acids - particles - enzymes - proteins A:
(A).
proteins