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Complete the student's science report about climate change.
"Rising temperatures _________________________ wildlife migration patterns. The _________________________ on polar bear populations has been devastating. Scientists worry that pollution will continue to _________________________ ocean ecosystems. However, new conservation policies may _________________________ positive change in the coming decades."
The correct answers are affect, effect, affect, and effect.
"Affect" is typically a verb meaning "to influence" (temperatures influence migration). "Effect" is typically a noun meaning "result" (the result on polar bears). "Affect" is again the verb (pollution will influence ecosystems). "Effect" as a verb means "to bring about" or "to cause" — here, policies will bring about positive change. This is the trickiest usage!