Câu 1,2 sgk 49 :
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Câu 1,2 sgk 55 :
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Câu 1 sgk 58 :
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Câu 1 sgk 63 :
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Câu 1 sgk 70 :
bạn tham khảo : htp://www.loptruong.com/bai-21-moi-truong-doi-lanh-39-2536.html.
Câu 1 sgk 76 :
bạn tham khảo : htp://www.loptruong.com/bai-23-moi-truong-vung-nui-39-2541.html.
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