Question

What conditions on Earth allow life to thrive?

Answer 1

Answer:

atmosphere containing free oxygen --> atmosphere shielding against UV --> ozone layer in upper atmosphere --> axis of rotation generally perpendicular to orbital plane --> magnetic field that deflects the solar wind --> liquid water --> temperature near the triple point of water --> range of temperature sufficiently narrow, over appreciable portion of the planet's surface, conducive to the chemistry of life

Answer 2

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