Organ. An organ is a system of tissues that work together on a larger scale to do certain jobs within an animal's body. Examples of organs are the brain, heart and lungs. Anatomy is an example of a biology specialty concerned with this level.
Answer:
The largest internal organ in the body is the liver by mass
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Tree planting is the safest solution to pollution. Save the earth, save our environment. Don't be cruel, conserve your fuel.
