Charles Darwin; he studied the different beak shapes/sizes of Galapagos finches and found that over time, they changed due to their needs for the food found around them (evolution).
Answer:
Animals and plants need nitrogen to build amino acids in proteins, which are the building blocks of life. Unlike oxygen, nitrogen cannot be absorbed directly from the air by animals and plants.
Explanation:
Lipids have the same elements as carbohydrates, but differ in their linkage. While the exact chemical structure of lipids varies, they generally have a much greater ratio of hydrogen-to-oxygen than carbohydrates.
