Alex is examining a mollusk. it has filter-like structures for feeding and it moves using a muscular foot. which mollusk is alex most likely examining ? a clam , which is a bivalve. a clam , which is a cephalopod. a nautilus , which is a cephalopod. a nautilus , which is a bivalves.

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