26. which of the following macromolecules are a prominent part of animal tissues that function in insulation, animals conserve heat?

a. carbohydrates
b. lipids
c. proteins
d. nucleic acids
e. water

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.

if the type of the food available changes, then the frequency of beak types will change, because birds with beaks more suited to the available food will be more successful over time.