Вопрос из теста по предмету Английский язык

Question

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What are vitamins essential for?
The vitamins as a class are not chemically related, and, they are classified according to their solubility and chief therapeutic effect into two groups: 1) water-soluble vitamins, 2) fat-soluble vitamin group. It is known to be essential for the maintenance of normal epithelial tissue.

Answer

They are essential for solubility.

Answer

They are essential for the normal functioning of the body.

Answer

They are essential for chief therapeutic effect.

Answer

They are essential for the maintenance of normal epithelial tissue.

Прочитайте текст и ответьте на вопрос: What are vitamins essential for The vitamins as a class are n...: ответ на тест 911573 - Английский язык