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食物链、食物网是生态系统的营养结构，生态系统的物质循环和能量流动是沿着此渠道进行的。假如在某温带草原上存在如图所示的食物网。请据图分析回答问题： (1)该生态系统的成分中，草属于______，猫头鹰属于______。 (2)该食物网的各种生物中，含有能量最多的是______。该生态系统的能量最终来源是______，其能量流动的特点是_________。 (3)在生态系统的物质循环中，碳元素以______形式在生物群落与无机环境中进行循环，生产者通过_____作用使碳元素进入到生物群落中，各种生物通过______作用使碳元素回到无机环境中。
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