The primary human source of greenhouse gases in earths atmosphere is:

a. Photosynthesis

b. The mining and burning of fossil fuels

c. the use of aerosol sprays

d. the removal of fossils

If 5 hints to stop germs from spreading when cooking or preparing food

Which of the following is correctly arranged from the lowest trophic level to the highest trophic level? A. Grass, bass, minnow, snake B. Grass, mouse, snake, eagle C. Bacteria, frog, eagle, hawk D. Algae, deer, wolf, hawk

What two molecules make atp

Why is the youngest rock found near mid ocean ridges

What advantages are provided to developing rural areas by building and using an anaerobic digester? Why does nitrogen have to be "fixed"? What organisms are responsible for nitrogen fixation?

Suppose you dissolve 1 gram of solid glucose crystals in 1 kg of water to make a solution. Which calculation would be best to describe the concentration of glucose?

What is an organic acid.

Cómo podemos utilizar correctamente artefactos eléctricos y electrónicos?

Most destruction in an earthquake is caused by - waves

Which macromolecule includes steroids? a. lipids b. proteins c. carbohydrates d. nucleic acids?