Flat face I believe is your answer
Well, different organisms require different things. A single celled bacteria does not need a lot at all compared to a plant or animal. One cell can support a bacrerium. An animal needs many cells to carry out the functions necessary for it to live.
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Water is used in many reactions in the body, both enzymatic and chemical. Water within blood and lymphatic system is responsible for the transport of hormones, antidotes oxygen and nutrients.
Metabolism can be described as entirety of chemical reactions which take place within a cell, the result of which is energy for processes which take place in the body.
I might be incorrect, but from what I remember it should be particle size
Hypertonic is where the solution has a lower water potential than the other side of the membrane. It has less water molecules and osmosis may occur under that in the presence of semi permeable membrane. Where water will flow from a higher water potential to lower water potential region