本题目来源于试卷: Interaction & Interdependence C.9 Transfers of Energy & Matter，类别为 IB生物学
[问答题]
1.Explain how limestone is fnh7u -*oqxk65a u*lrmaxp*rjkoj, )o .j9m(eade and describe the role it plays in the carbon cycle.
,j*e m( ro9p)aj kj.xo
2.Oil and natural gas are extracted to be used as fuels. Describe the formation of oil and natural gas.
3.Nutrients are cycled in all ecosystems. Draw and label the carbon cycle showing at least four stores or sinks and at least four flows or processes.
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