Why do unicellular organisms live mainly in watery environments?

Unicellular organisms are devoid of circulatory systems and will be found living in moist or watery environments to facilitate uptake of nutrients and gases and expulsion of waste by the process of diffusion. Their cell is structured such that it can engage in direct exchange of substances with its environment. Water serves as the perfect medium or environment through which this exchange can occur. Gases and nutrients simply diffuse into the cell or are moved into the cell by means of active transport or phagocytosis.

Ribonuclease activity is a type of nuclease that catalyzes the degradation of rna into small components.

Plants take energy from the sunlight with the of chlorophyll so the plant starts the food chain. then an herbivore eats the plant and gets its energy.then a carnivore or a human eats the herbivore and gets its energy. : )