The main source of energy for both plants and animals is A. water
B. fertilizer
C. glucose
D. carbon dioxide

None of the above.

I'm pretty sure the Sun is the main source of energy.

Explanation:

Here is what I found:

Energy from the sun is the primary source of energy for the earth's ecosystem. The sun's energy is collected and processed by plants through photosynthesis and converted into food for animals. Without the sun, animals would not exist. Food is stored energy and essential elements like carbon, nitrogen and hydrogen.

his research revealed two genetically different groups of prokaryotes, which justified splitting kingdom monera into two kingdoms. the genetic and cellular differences were so great, that these two kingdoms were eventually placed into different domains in the current three-domain system.

the farther away the object is from the central star (the sun) it's gravitainal pull on the object is weaker when it is farther

explanation: