Darwin noticed differences in the beak shapes of finches on the various islands of the galapagos and surmised that they all might have evolved from a common ancestor on the mainland. if darwin had known about molecular biology, a field of study that did not exist at the time he lived, how might he have used it to test his hypothesis?

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