What is the following structure-^
protein
lipid
carbohydrate
nucleic acid​

answer: b: experiments that showed that all cells are similar in how they metabolize and in their composition

explanation:

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.

c: warm water flows from the western tropical pacific toward south america. that should be the right answer! hope it .