Why do plants and animals need nitrogen

Polymerization reactions in which polysaccharides are synthesized from monosaccharides or proteins are synthesized from amino acids: a. result in the formation of water. b. are hydrolysis reactions. c. release energy. d.

Which of the following is needed for natural selection to occur? Select one: a. variation in characteristics b. differences in fitness c. heritability of characteristics d. all of the above

What is the action of the quadratus lumborum?

As fluid moves through a vessel, which factors determine the flow resistance? (Select all that apply.) - the length of the vessel - the radius of the vessel - the viscosity of the fluid - the pressure exerted by the heart

What is the powerhouse of the animal cell

After a hypothesis has been repeatedly tested and becomes widely accepted, it is considered a

The root of the tooth is held by the periodontal ligament a. True b. Falsee

At the center of the Andromeda galaxy is a source of x rays that scientist believe is a black hole with how many more times than the sun

True or false? The more similar two organisms are, the more distant their common ancestor is.

The blood-brain barrier a. is fully developed in humans when they are born. b. prevents many drugs from entering the brain. c. is designed to allow all drug compounds into the brain. d. cannot be penetrated, even with trauma to the brain.