Definition: This organ has many functions, including producing bile and synthesizing carbohydrates and fats.
Example: It is the largest internal organ in the body.

try using substitution:

x + y - 6 = x - y. (i'm not giving you the exact answer). since 0 = x - y, then sub 0 in the equation with x - y. combine your like terms, and then use inverse operations, and you'll have your answer.

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tissue

explanation:

it is actually formed by geoup of cells which is tissue

i think that is new experiments yield untrustworthy data and should be carefully considered, because you don't know what will happen with the experiments.