Agroup of birds is blown from the mainland to a small island during a storm. they remain there and develop into a new population.

A group of birds is blown from the mainland to a small island during a storm. They remain there and develop into a new population.  

Evolving

A population of humans lives in a secluded community and tends to intermarry within their own group. Occasionally they bring in young people from communities in other areas.  

Evolving

A large forested area has remained relatively untouched for thousands of years. The population of red oak trees has not been subjected to any known diseases or other environmental stresses.  

Equilibrium

In a rain forest, several populations of a monkey species coexist relatively close to each other. Each population has its own range, but mating sometimes occurs between adjacent populations.

Evolving

Explanation:

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