Answer.
(i) Each vitamin plays an important role in the healthy development of our body.
(ii) Natural vitamins are organic food substances found only in plants and animals. Our body is unable to synthesize vitamins. Because of this, they must be supplied either directly in the diet or by way of dietary supplements. They are absolutely necessary for our normal growth.
(iii) Vitamins cannot be obtained without ingesting food. That is why it is suggested that vitamins must be taken with meal. They help to regulate our body's metabolism.