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.

Select all that apply. Select the major grains produced worldwide. corn rice sugar cane sugar beets wheat

What has to be properly functioning in a unicellular organism for homeostasis to be maintained.

Which organelle would be highly prevalent in muscle and nerve cells?

Which taxon contains more different kinds of organisms a kingdom or phylum?

If a container of solution contains 15% of salt, what percentage of water does it contain?

The membrane in the ear is named for what musical instrument

The earths core is made up mainly of what 2 substances? 2. Like an egg, Earth has a core, a layer surrounding the core, and a thin, hard outer layer. Which layers of the earth match the layers of an egg?

Pyruvic acid is the final product of glycolysis, which is the first stage of cellular respiration. Why is pyruvic acid never the end product of fermentation.

The spread of pathogens how do we get sick worksheet answers

What is the purpose of the tympanic membrane