What is the primary rationale cited for the high confidence level in the existence of *microbial or simple* life?

Answer

Ubiquity of organic chemistry and habitable exoplanets

The high probability assigned to simple life is based on the fact that the chemical elements necessary for life are present everywhere, combined with the confirmed abundance of planets in regions where liquid water could exist.

What is the primary rationale cited for the high confidence level in the existence of *microbial or simple* life?

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