Flexible digits, a large cerebrum, and arms that rotate at the shoulder are characteristics of
a. birds.
b. reptiles.
c. amphibians.
d. primates.

The best and most correct answer among the choices provided by your question is the fourth choice or letter D.

Flexible digits, a large cerebrum, and arms that rotate at the shoulder are characteristics of primates.

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Ithink due to shortage of water

That is true tge cactus as a structural adaptation to its envirinment has it leaves reduced to spines. but this doesnt mean it cant produce food it produces food because of the presence of chlorophyll in its stem