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初三化学重点知识导入4：氧气
大气中的水形成了原始海洋，其中细菌分解着溶解在水里的化学物质。35亿年前，一些细菌在阳光照射下学会了光合作用，水分子被拆开，氧气就此出现在世界上。它帮助恐龙占领陆地，也带给生物能量。每天5分钟，快速提高化学成绩，只要微信搜索关注“化学大师”！
初三化学重点知识导入3/36
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