Because the thick waxy bark prevents the loss of moisture so it stops the plant dying of thirst
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To keep it warm at night because its COLD in the desert!.
Thick
A seals outer covering is thick skin.
structural adaptations
A cactus' waxy skin helps it retain moisture in desert climates.
Cacti have thick stems and skins because they need to store water over long periods of time, and the liquid would evaporate quickly in deasert conditions.
a cactus http://www.roythehandyman.co.uk
Cactus stems are very thick because they store water.
I think polar bears body covering is fur. ????????????????I think polar bears body covering is fur. ????????????????
Their stems are thick and sponge-like.