Protists are eukaryotic simple organisms which range in complexity from unicellular to multicellular types. The protists are organisms which exhibit some of the characteristics which are commonly found in plants and animals because of this reason it is difficult to classify protists, in plant or animal kingdom. Therefore, they are placed in the separate kingdom of Protista.
Plant like protists exhibit chlorophyll pigment which can also be found in the case of the plants. This pigment helps in trapping the light energy from sun which is necessary for performing photosynthesis. Example of protists which perform photosynthesis are dinoflagellates, diatoms, euglenophytes and chrysophytes.
The ratio of the actual amount of water vapor present in a volume of air at a given temperature to the maximum amount that the air could hold at that temperature, expressed as a percentage.