Question

which of the following must occur for speciation to happen?
geographic isolation
reproductive isolation
temporal isolation
behavioral isolation

Explanation:

Speciation is the process of forming new species. For a new species to be recognized, there must be reproductive isolation. Reproductive isolation means that members of a population can no longer interbreed successfully with the original population. Geographic isolation (like a mountain range separating a population) can lead to speciation but is not an absolute must (sympatric speciation can occur without it). Temporal isolation (breeding at different times) and behavioral isolation (different mating behaviors) are types of reproductive isolation mechanisms. But the over - arching requirement for speciation is reproductive isolation.

Answer:

reproductive isolation