Answer :
The alveoli, which are found at the terminal areas of the lung and are connected to the respiratory bronchioles, are the locations of gas exchanged in Multicellular organism. The lung's acinus is the area where gas exchange takes place. The alveoli's surface area is increased by their sac-like form.
Multicellular organisms can develop in a variety of ways, such as by cell division or the accumulation of several single cells. Many identical individuals coming together to form a colony results in colonial organisms. Colonizing protists have been referred to as "pluricellular" rather than "multicellular," although there are also multinucleate but technically unicellular macroscopic species like the xenophyophore that can be difficult to distinguish from true multicellular organisms.
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