Which element is found in proteins and nucleic acids but not in carbohydrates

Coquina, a type of limestone, forms from shell fragments that settle on the ocean floor. what type of rock is coquina?

Which of these is not a nucleotide base found in dna?

Kudzu vines grow by climbing and wrapping around trees. trees covered by kudzu can die because they are starved of sunlight. what type of relationship exists between the trees and the kudzu growing on them?