Genetic drift refers to changes in the gene pool of a population that result from . a type of artificial selection
random changes in allele frequencies
changes in the number of polygenic traits
injuries caused by male competition

Once an egg cell is fertilized by sperm, the cell then, as the embryo develops, it receives nourishment and eliminates wastes by transferring substances from its blood to its mother's blood. a. becomes a fetus immediately and exits the womb b. begins to divide and implants itself in the wall of the uterus c. remains in the uterus without dividing for several months d. travels back to the ovaries until the fetus is developed