Which of the following forces is responsible for keeping the planets in orbit around the sun? a. electromagnetic force b. friction c. gravity d. magnetism

What is the inability of an individual or a society to achieve a minimum standard of living known as ?

Which direction does the energy flow in this energy pyramid ?

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