The main energy source used by humans has changed over time from

A. fossil fuels to solar.

B. wood to wind.

C. wood to fossil fuels.

D. fossil fuels to nuclear.

White blood cells protect against

According to the hardy-weinberg principle, the p stands for: a. the most common allele b. the recessive allele c. the dominant allele d. the least-favored allele

What are the two parts of photosynthesis?

Which of the following characteristics does a fungi NOT have? a. cell walls c. heterotrophic b. prokaryote d. reproduce with spores

What broad leaves repel water?

What effect does sympathetic nervous stimulation have on digestion? A. Diarrhea B. Inhibits digestion C. Enhances digestion D. Vomiting

What was a primary reason for the revived popularity of the Ku Klux Klan?

A behavioral adaptation is ... Give at least 2 examples

Heme iron is found only in foods derived from the flesh of animals, such as meats, poultry, and fish. a. True b. False

As wind travels across the water's surface, it pushes against the water, and energy in the wind is absorbed by the water. What does the interaction between the wind's energy and the water form?