Which statement best describes why warm ocean currents are usually surface currents?

a) warm water is less dense than cold water.
b) ocean tides bring warm water to the surface.
c) warm water contains more salt than cold water.
d) ocean water loses heat to the air at the surface.

How do the kidneys affect homeostasis

A15.75-g piece of iron absorbs 1086.75 joules of heat energy, and its temperature changes from 25°c to 175°c. what is the specific heat capacity of iron?

Blood pressure the total amount of blood the heart pumps in one minute 2. cardiac output the number of times your heart beats in a minute 3. dilate the amount of blood that the heart can pump in a single beat 4. heart rate the force exerted on the walls of the blood vessels by the blood that moves through them 5. stroke volume to widen or get larger in size