NCEA Level 3 Biology | Fun Learning Quest for Kids

You are studying a population of birds on an isolated island. Over several generations, you notice that individuals with slightly longer beaks survive better during drought years because they can access seeds in deeper crevices. During wet years, shorter beaks are more efficient for smaller, softer seeds. If drought and wet years occur in irregular cycles, which evolutionary outcome is most likely for this population?

A farmer applies a new pesticide to control aphids. In the first year, 99% of aphids die. By the fifth year, the pesticide kills only 30% of aphids. Which of the following best explains this change in terms of natural selection?

Two populations of a flowering plant are separated by a mountain range. Over thousands of years, the mountain range erodes, and the populations come back into contact. When they hybridize, the offspring have reduced fertility. Which speciation process has most likely occurred?