What element is found in proteins but not in carbohydrates and fats? carbon oxygen calcium nitrogen?

What part of the brain is highlighted in the diagram below?

Guinea pig coat color is determined by a single gene. the allele for black coat color is dominant to brown. in a cross between twoblack-haired guinea pigs, 20 offspring are born. if both parents were heterozygous, probability would predict that approximately howmany of the 20 offspring would have brown hair?

Which macromolecule catalyzes chemical reactions this be considered enzyme chemical reactions thus he considering enzymes