September 2018 2 10 Report
Ketika kita mengihirup udara, apakah hanya oksigen yg kita hirup? jika iya adaah filter yg bisa menyaring unsur2 lain? Jika tidak, apakah unsur unsur yg lain diserap tubuh atau dikeluarkan bersamaan dengan karbondioksida?
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