The correct answer is - the release of methane from thawed permafrost.
In the past decade it has been noticed that the levels of methane are increasing in the atmosphere, and the biggest ''producer'' of this methane is the melting permafrost. There's huge amounts of methane trapped underground bellow the permafrost. But the permafrost is melting because of the global worming, so the methane is free to come out and go up in the atmosphere.
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<u><em>Some cartilage becomes bone through ossification during childhood development. </em></u>
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You forgot to include options.
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I think the answer is B middle stage
Please give me brainliest if it helped