Question

when a species from a mainland population colonizes an isolated island, and, over time, evolves and diversifies into multiple new species due to the new conditions on the island, this process is called
wallaces paradox.
adaptive radiation.
homologous recombination.
coevolution.

Explanation:

Adaptive radiation is when a species colonizes an area and diversifies due to new conditions. Here, mainland - to - island colonization leads to multiple new species.

Answer:

adaptive radiation