chi oi cho em hoi 1 cau . trong tuyen tap olympic sinh hoc co cau hoi sau:" nganh giun dot co he tuan hoan kin .nganh chan khop tien hoa hon nganh giun dot vay theo em nganh chan khop co he tuan hoan kin hay ho ? tai sao?" tuy nhien em kha phan van la cau hoi nay co o 2 de o 2 truong khac nhau...
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