A class observes a mother bear and her cubs in the river. She is helping her cubs to survive. How is the mother helping her cubs survive? A. She is teaching them how to swim, B. She is teaching them how to get clean. be C. She is teaching th th how to catch food, D. She is teaching them where to find 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