An example of an animal that has a notochord but lacks a backbone is a

a. tunicate.

b. fish.

c. bird.

d. all of the above

PCR is a useful technique because A. it makes enough copies to eliminate mutations B. it makes enough copies to study the DNA C. it makes materials needed for unzipping the DNA helix or D. it makes more copies than a restriction map does

Which division of the nervous system consists of the brain, spinal cord, and optic nerves?

What is the purpose of a scientific classification system?

As a high-speed projectile enters the body, it can create a pressure wave that causes additional damage. this is called

The oxygen which is released into the air by a plant originates from: the release from carbohydrate decomposition from co2 gas splitting of water molecules protein synthesis

What is it called when you interpret the things you observe

Rubidium-87 has a half-life of 48.1 billion years. After how many years is there 25 percent parent isotope and 75 percent daughter isotope contained in the object?

In what layer are convection currents found? A. Continental crust B. Inner core C. Asthenosphere D. Oceanic crust

The major organs which control acids and bases in the body are: Select all that apply.

What is it called when some traits require more than one gene to be fully expressed?