Answer:
their density is only lighter than water because of the air inside. without the air you would sink even if you were holding it firmly.
Explanation:
The answer is D. hope I was right
The answer is 30.
Explanation:
The total number of protons and neutrons in a nucleus is called mass number. So 14 proton plus 16 neutron is = 30 mass number.
Blood is pumped throughout the body by your heart. Your heart is the main organ responsible for blood circulation.
