Which is not essential for evolution to happen?

A. Natural selection

B. A population

C. Inherited variation

D. Change in allele or genotype frequency

What is the blood volume of an average-sized adult male?

Which types of cells (animal, plant or bacteria) are most similar?

Marco accidently broke a crayon while coloring. Which of the following best compares the broken crayon to the original cray A. The total mass of the broken crayon pieces are the same as the original crayon. B.

Single strands of nucleic acids are directional, meaning that there are two different ends. What functional groups define the two different ends of a strand?

Which minerals can scratch glass, have a non-metallic luster, and fracture?

A chipmunk's body uses multiple organs to absorb nutrients from a seed. Which statement correctly describes how two organ systems work together to absorb nutrients from the seed? A.

Suppose that in barley plants, the allele for tall stalks is dominant over short stalks and the allele for wide leaves is dominant over thin leaves.

Gamma rays and X-rays are similar because they both have? A. high frequencies and high energy. B. low frequencies and low energy. C. high frequencies and low energy. D. low frequencies and high energy.

Noise pollution from a racetrack is an example of a positive externality. t or f

What kind of organisms can be described as chemosynthetic?