Answer:
it affects the hardness of the shells because calcium has a high reactivity which causes the shell to be hard
Explanation:
The answer is to the ground.
Gravity refers to the force that holds together the universe. On Earth, the gravity attempts to change the velocity of all the objects on the Earth's surface toward the ground at a rate of 9.8 meters per second squared according to Galileo.
Small intestines. <span>Although some </span>digestion<span> begins in the stomach, </span>most digestion<span> and absorption </span>take place<span> in the small intestine. The purpose of the small intestine is to finish </span>digestion<span> and absorb nutrient.</span>
Answer:
It prevents harmful substances from entering a cell.
Explanation: