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 energy absorbed in the light reactions is used to drive this process, with the end result being sugar molecules with energy stored in the carbon-carbon bonds of the sugar. The 3 types of photosynthesis differ in details of how these processes are carried out. Normal: photosynthesis is carried out by most plants growing in areas with sufficient water. In this type of photosynthesis, an enzyme called RuBP carboxylase grabs CO 2 in one of the first steps of photosynthesis.