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Let's think about this for a minute and you'll figure it out. Do they need to be protected from extreme temperature? Do they need something to keep water from evaporating too quickly and drying them out? Yes, so they'd need a thick protective cuticle.
It restricts cuticular transpiration
This is a reasoned guess but I would say arid regions such as the desert to prevent water loss.
thick, waxy cuticles
cuticle coating on leaves and thick epidermal cell walls
The desert; a thick cuticle will prevent/reduce water loss
Let's think about this for a minute and you'll figure it out. Do they need to be protected from extreme temperature? Do they need something to keep water from evaporating too quickly and drying them out? Yes, so they'd need a thick protective cuticle.
It restricts cuticular transpiration
Two adaptions would be the thick cuticle covering the epidermis of desert plants that helps to retain water and also the closing of the stomata during the day and taking in CO2 at night for the same water retaining purpose.
Thick cuticle limits transpiration.
No.
Succulent plants have thick, fleshy stems and/or leaves. In the Americas that includes the cacti.
This is a reasoned guess but I would say arid regions such as the desert to prevent water loss.
Examples of plants with a waxy cuticles are: the Agave, several types of cacti, and aloe. Basically it is any plant which has a thick waxy skin. The wax aids in the prevention of water loss. and ballsuckers
So they won't be hurt by the prickly desert plants they eat.
For protection against fauna
Arthropods, more specifically, crustaceans, have a thick, tough cuticle and two pair of antennae. The cuticle acts as an exoskeleton and two pair of antennae to help them find food and keep them safe.