Photosynthesis is important to living organisms because it is

the foundation of most food chains.
the source of nitrogen gas in the air.
how animals get carbon dioxide to breathe.
the process that occurs in most ecosystems.

Plz plz plz quick! 49 points for whoever which of the following statements about greenhouse effect is true? *life on earth is suffering because of greenhouse effect *the greenhouse effect is caused by human activity *all greenhouse gases are harmful *life on earth would not exist without the greenhouse effect

How does the nervous system affect the excretory system?

What conclusion can be made based on the temperature of soil when the light hits the soil at 0°, 45°, and 90° angles in section 2 of the experiment? did your results support your hypothesis? why or why not?