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They are possible signatures of life on a planet's atmosphere. Earth has a rich atmosphere in chemical elements such as Oxygen and Methane, those particles also affect the incoming sunlight, which scatters and absorbs in a different way when compared to planets without life forms.
However, it is believed that those signatures were only detected 2 billion years ago on Earth, even though life began developing approximately 3,5 billion years ago. Therefore, it is reasonable that an exoplanet is bearing life, but its biomarkers levels cannot be measured by our current technology.
If we detect them, it is necessary to discard all other explanations before considering that the signatures are caused by biological processes.
