Which scenario is an example of a functional adaptation? A. A male bird lets out a mating call to attract a female bird. B. Poison dart frogs produce a toxic venom that they can secrete out of their skin. C. Cobras elongate their bodies and hiss when they’re threatened. D. The color and shape of a flounder allow it to camouflage itself on the sea floor.

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