Help please Veins have to ensure that blood under low pressure can return to the heart.
The circuit of circulation that goes from the heart to the body cells and back to the heart is called circulation.
he oxygenated and deoxygenated blood are kept separate in the mammalian heart by the .

How do temperature and salinity affect deepwater currents? question 15 options: as temperatures and salinity levels of water increase, the water rises to the surface where it creates currents as it moves to colder regions. they create changes in wind direction, moving denser water in the same direction as the wind and causing the deepwater circulation patterns found in the ocean. they equalize the forces on undersea currents caused by the coriolis effect as they replace more dense water with less dense water. they create density differences that cause dense deepwater currents to flow toward the equator where they displace less dense, warmer water above them.