5단원 정리 문제
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It's my pleasure to be here. 에서 가주어 진주어 찾기
가주어 : it, 진주어: to be here
what is a keystone species? (안 보고 말하기, 우리말로 해도 인정)
It's one species that has a huge effect on the ecosystem where it lives.
Without the keystone species, what would happen to the ecosystem? (영어로 답하면 25점, 우리말로 답하면 10점, 보고 말하면 안됨)
It would collapse.
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