What is nessecary for a convection cell to be set up in a fluid?

1.) Thermal gradient and changes in density.

2.) Changes in density

3.) Thermal gradient

Why are more diverse populations more stable?

During childbirth, the head of the baby pushes against the mother's cervix. A nerve impulse is transmitted to the brain which causes a release of oxytocin. Oxytocin stimulates uterine contraction and pushes the baby towards the cervix.

Adverse reaction to a normally harmless substance in food that does not involve the body's immune system

Choose from the following all that blood plasma contains. protein water nutrients blood platelets waste materials minerals clotting factors white blood cells

Which of the following planets has the weakest surface gravity? A. Neptune B. Mercury C. Jupiter D. Earth

What is the position of heart valves when blood pressure is highest in the aorta?

The organelle within eukaryotic cells that contains genetic information is the

What is the major function of the valves found in human veins?

Lipids in a bilayer can diffuse laterally at a relatively fast rate, but / "flip-flop/" from one leaflet to the other very slowly without catalysis.

Which of the following groups contain organisms that have tissues and organ systems? A. prokaryotes. B. bacteria. C. eukaryotes. D. protists.