Which best explains how the human body obtains energy from food?
a. by breaking and reforming chemical bonds
b. by exhaling carbon dioxide
c. by inhaling oxygen into the lungs
d. by removing dangerous wastes

Is there any danger to eating mold?

If scientists are wrong about earth's age based on radioactive material and the decay rates are really much faster, how would nuclear power plants be affected?

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