Billy and juan were out hiking. they crossed the train tracks and all of a sudden juan shouted: "i think i hear a train! " "i can tell you for sure if a train is coming," said billy. what did billy do? a) he put his ear to the train track. b) he cupped his ear with his hand. c) he closed his eyes and listened. d) he stuck his head underwater.

Molecules called lipids have long hydrocarbon chains that determine the way they act. they can be fats, oils, or hormones, and even exist in our cell membranes 

D. pray lands grasslands swamps

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