Unlike green algae which can only live in water, a waxy covering over the epithelial cells of plants, called the (s) them retain water and gave them the adaptation needed for terrestrial life.

Cuticle

Explanation:

Plant cuticle is a waxy covering over the aerial epidermal cells of all the plants. Waxes are composed of cutin and a various organic solvent-soluble lipids. The cuticle is an extracellular hydrophobic layer which provides protection against desiccation and external environmental stresses.  In other words the cucticle helps to retain water and give plants an adavanthe to live  terrestrial life.

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