In large, massive stars, fusion occurs through a multiple step process referred to as the carbon-nitrogen-oxygen cycle. During this cycle the larger elements, carbon, nitrogen, and oxygen, are formed. The nuclear equation represents one step in this process.
What element is missing from this equation?

The answer is letter c

By water evaporation from the leaves is created a negative pressure at the top of the tree that promotes the ascension  of the water through channels that are called xylem. there are also two molecule forces that are involved: the intra-water molecules cohesion (water molecules stick to each other) and the adhesion when the water molecules stick to the channels they are running in. this is what enables water to go from the roots to the top of a tall tree.

Bis the