The answer is going to be B) lipids. Here’s how I would approach this question. I would eliminate answer choice A because carbohydrates gives animals energy. Then I’d eliminate answer choice C, because proteins are the building block(s) of the body. I’d lastly eliminate D and E because water is macromolecules (at least I don’t think water is) but nucleic acids store genetic information. Lipids are literally fat and what keeps us warm during the cold (sometimes)? Body fat! It’s not always a bad thing. Also you can think of a polar bear, they have so much body fat and that helps keep them insulated & warm.
