Question

a waxy substance on the outer walls of the epidermis​

Answer 1

Answer:

cuticle

Explanation:

Cutin and waxes are fatty substances deposited in the walls of epidermal cells, forming a waterproof outer layer called the cuticle. It also prevents excess of transpiration.

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Answer 2

Answer : Cutin is the waxy substance present on the outer walls of the epidermis to prevent water loss.