The first cells were probably photosynthetic
The appropriate answer is the dew point is lowest in the afternoon. Dew point refers to the stage at which water droplets from via the process of condensation. It is the temperature to which the air must be cooled to allow this process of condensation. Humidity refers to the amount of water vapor contained in the surrounding air.
Many reasons to be honest but the main one is because of erosion and the water levels (rising and falling)
