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【简答题】
（9分）自然界除了水循环和氧循环之外，还有一种重要的物质循环——碳循环。以下是有关碳循环的图解，图中CO2代表二氧化碳，H2O代表水。据图回答下列问题： （1）图中①②分别代表两种重要的生理作用。 ①代表的是____作用，②代表的是____作用，请写出①的反应式： （2）图中③④分别代表哪类生物？ ③代表的是____，④代表的是____。 （3）图中 不需要从外界获取有机物就能生存。 （4）从图中可以看出，如果没有③，碳循环还能进行，从而说明③在生态系统中的作用是 。（2分）
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C.
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