Which pH does the lipids need to be digested?

Lipids need a pH between 4 and 5.5 to be digested, because this is the optimum pH for the lipase enzyme to act.

Explanation:

Lipids are organic macromolecules necessary for vital functions, derived from fats and oils consumed with food.

Lipids are digested in the stomach by the lipase enzyme produced in the pancreas. Lipase performs best at an acid pH, between 4 and 5.5, which is the pH required for lipids to be digested. A different pH slows down the effect of the enzyme, or inactivates it.

the fossil record provides evidence of a common ancestor to many species.

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