Respiration requires O_2. How did the first c | vedclass

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(B) Respiration does not always require $O_2$.- Some living organisms survive in the absence of $O_2$ by performing anaerobic respiration.- The first

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They performed anaerobic respiration.

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(B) Respiration does not always require $O_2$.- Some living organisms survive in the absence of $O_2$ by performing anaerobic respiration.- The first cells on Earth,such as early prokaryotic organisms,obtained energy through anaerobic processes or by breaking down inorganic substances.- For example,in chemosynthetic bacteria (like sulphur bacteria),chemosynthesis occurs as follows: $12H_2S + 6CO_2 \rightarrow C_6H_{12}O_6 + 6H_2O + 12S \downarrow$.

Respiration requires $O_2$. How did the first cells on the earth manage to survive in an atmosphere that lacked $O_2$?

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