Lactase is an enzyme that is produced in the lining of the intestines. this enzyme the body speed up the breakdown of carbohydrates that are found in dairy products, such as milk, yogurt, and cheese.
which general function does lactase perform?
fighting disease
creating movement
regulating cell processes
sending chemical messages

relationships play a major role in a human's emotional and mental wellbeing. healthy relationships with the people around you are even linked to a smaller production of cortisol, a stress hormone.

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).