Answer:
Cell
in any multicellular organism is the smallest functional living entity. When
many morphologically and functionally similar cells start functioning as a
group. They forma tissue, which makes an organ performing a special function.
e.g., properties of tissues of stomach and intestine of digestive system
is a co-ordinated function of different tissues to perform the functions of
digestion of food material. So, this property of digestion is the property of
tissues and the organ, i.e., stomach, but not the property of individual cells
which make the tissue and organ of the digestive system.
Similarly, many neurons make nervous system and muscles make muscular
system, but individual nerve cell/muscle cell cannot perform the function of
control, coordination and locomotion.
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