Drag the pink labels to indicate which type of interaction occurs between each pair of species. Based on those interactions, drag the blue labels to indicate the population changes Knight predicted for each species in the two different treatments. Labels can be used once, more than once, or not at all.

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