We can actually deduce here that what cuticles does for land plants that was not necessary for ancestors that lived in water is: Cuticles help prevent water loss.
Plant cuticle is actually known as an extracellular hydrophobic layer which is known to cover the aerial epidermis of every plant. This plant cuticle actually provides the plant with protection against every external environmental stress.
We see here that the cuticle in land plants actually help to protect and prevent water loss in plants.
Thus, we see that the above answer is correct.
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