Blood is moved through the vascular system by

A. valves in the wall of the blood vessels.

B. peristalsis caused by smooth muscle in the blood vessel walls.

C. pressure gradients created by the heart.

D. osmotic pressure.

E viscosity of the blood

What is the difference between meiosis II and mitosis?

Why is there no way to remove an immune response?

What kind of cells that need to make a lot of protein called

Which of the following is not a function performed by a membrane protein? Hormone binding sites A. B. c. Cell adhesion Enzyme synthesis Pumps for active transport

Some questions fall outside the realm of science; which of the following questions could not be answered using the scientific method? a. What is the function of the appendix in human beings? b.

How long does gunpowder residue remain on a shooter's hands? A few hours About 24 hours A few days About a week

Why are some planets made of frozen gases and others solid?

The skin is the primary organ of the

What is true for urochordates? A. The notochord is present throughout their lives. B. The notochord is present only in the larval stage; it is absent in adults. C. The notochord is present in the larval stage; it becomes vertebrae in adults.

What term is used to refer to a characteristic of a population in statistics?