However, the absence of perfect concealment does not imply the presence of active advertisement, and if fertility were advertised in humans, we would presumably not need to employ sophisticated experimental methods to demonstrate its detectability. (Steve Stewart-Williams)

However, the absence of perfect concealment does not imply the presence of active advertisement, and if fertility were advertised in humans, we would presumably not need to employ sophisticated experimental methods to demonstrate its detectability.

Steve Stewart-Williams

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absence employ experimental need perfect presence

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