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.
All 3 forms of photosynthesis are based on two pathways. The first are the light reactions, where energy from the sun is absorbed by the chlorophyll of the plant, and the energy is transferred to hydrogen ions which are split off from water (Oxygen is produced at this point).