Based on the context, stimulus refers to- A)outside reactions that monitor your bodily systems.
B)the temperature of the body.
C)food that gives your body energy.
D)a thing or event that causes a reaction.

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