When using a dichotomous key, what question about a specific characteristic would best help you distinguish between a goldfish and a snake?

A. Does the animal have scales on its body?

B. Does the animal have feet?

C. Does the animal have a mouth?

D. Does the animal breathe under water?

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