The human body uses specialized biomolecules to speed up chemical reactions. These are called enzymes. Without enzymes, the reaction in the body would happen too slowly to keep you alive. Which biomolecule do enzymes belong to?
A. Proteins
B. Lipids
C. Nucleic acids
D. Carbohydrates

genetic variation can be caused by mutation (which can create entirely new alleles in a population), random mating, random fertilization, and recombination between homologous chromosomes during meiosis (which reshuffles alleles within an organism's offspring).

c. establishing proper sleep hygiene