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XxpinkgothicxX
An organ is a group of tissues in a living organism that has a specific form and function. Organs are grouped together into organ systems. Organ systems perform a specific task.
darksoul05
An organ is self-contained and has a certain function (or job).

How an organ is made is by a group of tissues ( which is made by a group of cells)

Hope this helps!! :-)

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