Which of the following is a downside of solar energy? a. it requires areas with good sun exposure. b. it is a renewable resource. c. it is abundantly available. d. it has reduced greenhouse gas emissions

Which of the four major uses is predicted to change the least by 2020?

Ascientist is conducting an investigation that involves water, silver, carbon dioxide, and oxygen gas which group of statements best describes all of the materials he is using in the investigation?

What is the main function of the central vacuole in a plant cell? a. absorbs energy from the sun to produce food b. holds water and maintains turgor pressure c. breaks down molecules to release energy d. contains the cell's genetic material