Question

how does the cactus adpat itself to the desert habitat​

Answer 1

from it's long Roots which hi deeper in the sand which helps on gaining water

Answer 2

cactus adapts itself to the desert habitat by:
reducing its leaves to spines in order to reduce transpiration. a thick waxy cuticle is also present on the surface of the leaves for this purpose.

modifying the stem into flattened structures for performing photosynthesis and meeting the food requirements.

hope this helps you