Read the passage

Metamorphosis is the process by which caterpillars become butterflies and tadpoles become frogs. It is a process studied by young children in school and by scientists who want to understand how pollution affects an eco-system. But change is not just a scientific phenomenon. It is a part of life. We experience it every day.

Which best expresses the main idea?

A. Change is a part of daily life.

B. Metamorphosis means the process of changing.

C. Pollution affects both animals and humans.

D. Frogs start life as tadpoles.

The main idea of a text is the central point the author is trying to convey. The main idea can be introduced at any point in the text - its beginning, middle, or end. In the given passage, the author explains what metamorphosis is, the reason students and scientists study it, and then delivers the main idea - that change is something we all go through daily and not just a scientific phenomenon caterpillars and tadpoles experience. That is why statement A is the correct option. All other statements are technically correct but do not represent the main idea. In a way, they are statements that support the main idea.

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