The axis is an imaginary line going through the earth so the way the earth is "tilted" would tell you,for example, if the northern hemisphere is tilting toward the sun, it will be summer in the northern hemisphere.
this ones simple all the others don't use sunlight because they cant make food within themselves but plants on the other hand use direct sunlight to make their food unlike the others. ;]
Biotic:
-predator
-competition(relationsip)
abiotic:
-sunlight
-water
During nitrogen fixation, bacteria breaks nitrogen gasses down into a usable form for plants.