Question

what is the main difference between adaptive radiation and other forms of speciation?
o adaptive radiation is a mechanism for evolution.
o adaptive radiation happens over a relatively short time.
o adaptive radiation requires a founding population.
o adaptive radiation occurs only on islands.

Explanation:

Adaptive radiation is characterized by the rapid diversification of a single ancestral species into a multitude of new species, often in a relatively short - time frame as they adapt to different ecological niches. Other forms of speciation may occur more gradually over long periods. The other options are incorrect as: evolution mechanisms are common to many processes, founding populations are involved in other speciation too, and adaptive radiation is not limited to islands.

Answer:

Adaptive radiation happens over a relatively short time.