Answer:
sunlight
Explanation:
The plants and animals get confused with the artificial light that is used by the human beings.
The best word to fill the blank is "saturated". Hydrocarbons with only single bonds are saturated. These hydrocarbons are the deemed to be the simplest class. They are called saturated because each carbon is bonded to as many hydrogen as possible.
The Leaves it's B because to maintain photosynthesis it must be reached through the Leaved
C is the answer i believe
