Question

question 9
notice the resemblance of the cactus, which grows in the american desert, to the euphorbia, which grows in the african deserts. both have fleshy stems armed with spines. these adaptations help the plants store water and ward off predators.
euphorbia
cactus
which type of evolution, co - evolution, divergent, adaptive radiation, convergent, or punctuated equilibrium is best represented by these two organisms? justify your answer.

Explanation:

The problem is about the evolution of two organisms (cactus and euphorbia) that have similar adaptations (fleshy stems with spines) despite growing in different deserts (American and African) and likely being from different lineages. Convergent evolution is when unrelated organisms independently evolve similar traits due to similar environmental pressures. Here, both plants evolved fleshy stems and spines to adapt to arid desert environments, even though they are not closely related.

Answer:

Convergent evolution. Justification: Cactus (American desert) and euphorbia (African desert) are unrelated but evolved similar traits (fleshy stems, spines) to adapt to arid desert environments, which is the definition of convergent evolution (unrelated organisms developing similar adaptations due to similar environmental pressures).