Question

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Why caterpillars need to shed their skin when they grow bigger but humans do not?
Do you have any idea?​

Answer 1

Answer:

A caterpillar’s ‘skin’ is actually its exoskeleton, made of a hard material called chitin. As the caterpillar grows, it’s exoskeleton does not grow with it. Instead it develops a new exoskeleton underneath, which is softer. A time comes when the old exoskeleton can no longer stretch to accommodate the caterpillar’s growth - this is when it sloughs off the old ‘skin’.

Human skin is far more flexible, and it comes in two parts. The dermis is the inner, living skin, in which are the root hairs, oil glands and sweat glands. The epidermis is the outer ‘dead’ skin, which is made of dead dermal cells. Bits and pieces of the epidermis fall off all the time - while bathing, while washing hands, while moving around, while sleeping. The pieces are so tiny you can’t see them. If skin is too dry (because the oil glands don’t make a lot of the oil that keeps the skin waterproof), the epidermis falls off in larger pieces - which we know as dandruff.

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