What causes the differences in physical characteristics like hair color among people?

A: different version of genes

B. Variations in DNA length

C. Different number of chromosomes

D. Variations in nucleus size

Hurry in a test

White meat contains less syoglobin than red meat. Red meat contains more (slow-twitch / fast-twitch) muscles than white meat does.

Which problem is most directly caused by burning waste? O A. Toxic chemicals in the air O B. Growth of algae in lakes O C. Pollution of groundwater O D. Harm to marine life

Enzymes are specific. This means that they

A tool you hold against your eye to make object look bigger is?

Which statements describe disadvantages of using natural gas as an energy source? Check all that apply. It is expensive to use. It is hard to stop using. It is a nonrenewable resource. It is damaging to the environment.

How does low body temperature affect the bloods ability to carry dissolved oxygen?

At which trophic level are dragonflies that consume

Which example is an organism? A. bacteria B. heart C. clay D. soil

What are some examples of a chemical reaction?

If you continue to increase the intensity of light that a plant receives, what happens? A. The rate of photosynthesis increases indefinitely with light intensity. B. The rate of photosynthesis decreases indefinitely with light intensity. C.