To keep it warm at night because its COLD in the desert!.
uadsa
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Because the thick waxy bark prevents the loss of moisture so it stops the plant dying of thirst
Thick
A seals outer covering is thick skin.
structural adaptations
A cactus' waxy skin helps it retain moisture in desert climates.
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. ????????????????
a thick fur coat.
Their stems are thick and sponge-like.