Because the reaction it makes them turn that way.
The seperation between periods and species alive in those time periods
These crops generally are herbicide and pest tolerant, but other GE crops in the pipeline focus on other traits.
So based on information i think the answer is D.
Cellular respiration input: pyruvate (partially oxidized glucose), ADP, and inorganic phosphorus. Output: ATP, carbon dioxide, and water. Photosynthesis input: water, carbon dioxide, and photon energy. Output: Oxygen and glucose.
They have 3 parts in the human brain.