The bottom driver is like the suspension for the sled, resulting in a smoother travel. And yes, the handles for the bottom athlete are significant too. The top man who sees the track signals the man in bottom (mostly using head movement) to help steer.
The two reactions which occur during photosynthesis are light  reaction and dark reaction. Light reaction takes place only in the  presence of light. Dark reaction can occur â¦ with or without light. 1 person found this useful.
The Light Reactions Reactions that depend on light occur during the first phase of the process of photosynthesis. These processes take place in the grana that house chlorophyll. Molecules of chlorophyll absorb light. Energy from the absorbed light causes reactions that result in the formation of a substance called ATP. Oxygen is released into the atmosphere. In fact, the largest source of free oxygen in the atmosphere is as a byproduct from photosynthesis. The Dark Reactions The second phase of the process of photosynthesis can occur in light or darkness.