Why are nitrogen-fixing bacteria important in ecosystems?

two of the four are biomolecules are proteins and nucleic acids. what is the relationship between proteins and nucleic acids?

Sharks and other predators do not normally eat plants however they do receive some energy from plants how is this possible

What is the composition of humus? a) organic material b) sand and water c) subsoil d) inorganic material

Why was it so difficult for scientists to recognize how plants reproduced?

What is the effect of a rise in income tax on the labor supply market? A) It decreases aggregate supply and potential GDP. B) It increases aggregate supply and potential GDP. C) It decreases aggregate supply, but does not affect GDP.

Match the description in column 1 to the corresponding parts of the nervous system in column 2. A. Brings messages to your brain through your spinal cord autonomic B. If you stub your toe, this carries the message peripheral C.

when listening the levels of orginization in orginisims from the smallest to most complex, which level is just below organs in complexity

Relative to rainfall, the tundra is most like what other biome

Which artery is felt when taking the pulse at the wrist?

How does skin prevent entry of micro organism in the body