Phosphorus is difficult for plants and animals to access in nature because___ A. It reacts quickly with other elements, like nitrogen
B. It is typically bound as phosphate
C. Most phosphorus in the environment is stored in reservoirs
D. Most phosphorus in the environment is bound to carbon, nitrogen, and hydrogen

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