Describe two ways solar energy can be used to reduce fossil fuel use.

The similarities of organisms in which two areas numbered above provide the best evidence for common ancestry between organisms in both locations?

Amino acids contain the elements carbon, hydrogen, oxygen, nitrogen, and sometimes sulfur. of the 20 amino acids found in humans, 11 are called "nonessential" because they can be manufactured by the body when needed. which elements in these 11 amino acids are commonly obtained from the metabolism of sugar molecules?

Which of the following is a period in the paleozoic era? devonian cambrian permian all of the above