Which one of the following factors is biotic?

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(B) Biotic factors refer to all living organisms or their biological products in an ecosystem. Among the given options,$CO_2$ content in the soil is i

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CO2 content of the soil

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(B) Biotic factors refer to all living organisms or their biological products in an ecosystem. Among the given options,$CO_2$ content in the soil is influenced by the respiration of soil organisms and plant roots,making it a factor related to biological activity. However,in the context of standard ecological classification,all options provided (Photoperiod,$CO_2$ content,Soil texture,Rainfall) are technically abiotic factors. If the question implies which factor is most directly influenced by biological processes,$CO_2$ content is the most appropriate choice as it is a byproduct of respiration.

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