One of the most accurate ways of determining evolutionary relationships is looking at differences in biological molecules. Which of the following molecules could be used? Lipids
Carbohydrates
DNA and proteins
All of the above​

so whats the answer

b. to discover aspects of the natural world.

hopefully i .

the nitrogen cycle provides nitrogen to the ecosystem from the atmosphere, ground and oceans. nitrogen is an important component of complex molecules such as amino acids and nucleotides, which lead to the creation of proteins and dna, the building blocks of all life. plants absorb nitrogen in the form of ammonium, nitrate ion and, on rare occasions, as amino acids. animals receive nitrogen necessary for biological processes from feeding on living or dead organic matter.