What is the purpose of the biogeochemical cycles?

a. to cycle energy through a food chain
b. to recycle matter through the biosphere
c. to recycle rocks through the layers of earth
d. to cycle nutrients through the human body

Which of the following is a true statements about viruses? viruses have no nucleus. viruses are alive. viruses have a cell membrane. all viruses are deadly.

What is the difference between hypothesis, theories, laws, and observations?

Solar energy causes water to evaporate into the atmosphere. how does that water vapor become a cloud? a) as the water vapor goes higher in the sky, the air gets cooler. the cooler air causes the water vapor to condense. b) as the water vapor goes higher in the sky, solar energy causes it to condense around particles of dust. c) as the water vapor goes higher in the sky, the air gets warmer and the water vapor begins to condense. d) as the water vapor goes high into the atmosphere it turns to ice and that's what forms clouds.