Answer: 1.) The three important need for water includes:
--> it is important for biochemical mechanisms such as digestion and cellular respiration
--> it serves as a habitat for many species of plants and animals.
--> it participates in cycling of all materials used by living things.
2.) Water is distributed through the biosphere by WATER CYCLE.
Explanation:
Water is necessary for the maintenance of life which is distributed through the biosphere by a cycle known as the WATER CYCLE.
All living organisms contain a high percentage of water. Plants take up water form the soil in large amounts and lose most of it by transpiration. Only a small amount of the absorbed water is used in photosynthesis and other metabolic reactions. Animals take in water constantly from their food and drink. Like in plants, most of the water they take in comes directly from the non- living environment and not through the food chain. They lose most of this water in the air they breathe out, in faeces and urine. All living organisms release water during cellular respiration.
In nature, water circulates mainly within the abiotic ( non living) environment; only a small portion recycles through living organisms.
Water cycle is maintained mainly by the evaporation and condensation of water in the abiotic environment. Water that enters the biotic components of the ecosystem returns to the abiotic environment through respiration, decay, excretion and transpiration.
