Answer:
Are made mostly out of rock and iron
Explanation:
The first one cant be correct because both Venus and Mercury don't have moons.
The planets made out of helium and hydrogen are gas giants.
Terrestrial planets are inside the asteroid belt.
So the answer has to be the second option of "Are made of mostly rock and iron"
Oxygen and carbon dioxide travels to and from tiny air sacs in the lungs, through the walls of the capillaries, into the blood. Blood leaves the heart through the pulmonic valve, into the pulmonary artery and to the lungs.
Its the center of the cell so the nucleus
Answer:
A
Explanation:
water expands as it goes from liquid to solid. When the temperature is warm, water works its way into cracks in rock. When the temperature cools below freezing, the water turns to ice and expands. The ice takes up more space.
