Answer:
The Liver
Explanation:
The liver's main job is to filter the blood coming from the digestive tract, before passing it to the rest of the body. The liver also detoxifies chemicals and metabolizes drugs. As it does so, the liver secretes bile that ends up back in the intestines.
In many different places to find them. Like pancreas, ovaries, testes, thyroid, parathyroid, hypothalamus, and neuro-endocrine organs.<span>
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A. Earth worms
Because it can only flow one way
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