내용의 흐름상 적절하지 못한 문장은? The earth is a planet full of life. One of the reasons for this is that our sun is the kind of star that can support life on a planet. All the time the sun continues to send out a steady supply of heat and light. For our sun is a stable star.

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4. Life could exist under these great changes. We are here because a steady amount of energy pours forth from our sun.

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This means that it stays the same size. And its output of energy (heat and light) does not change much.

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Some stars are not stable. They grow bigger and hotter and then smaller and cooler.

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The heat and light they send out vary greatly. If our sun behaved like that, the earth would boil and freeze repeatedly.

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Life could exist under these great changes. We are here because a steady amount of energy pours forth from our sun.