What similarity is observed between American cacti and African euphorbias due to convergent evolution?

Answer

Both evolved fleshy stems for water storage and spines for defense.

In dry regions, both cacti and euphorbias independently evolved mechanisms to solve the problem of water conservation and defense against thirsty herbivores by developing thickened, fleshy stems and sharp spines.

What similarity is observed between American cacti and African euphorbias due to convergent evolution?
biologyevolutionselectionconvergencetrait