What is the advantage of fine cosmic dust delivery compared to a massive cometary impact concerning organic survival?

Answer

Fine cosmic dust particles often survive atmospheric entry relatively intact

Microscopic dust grains shed by comets and asteroids can rain down constantly and often survive the heat of atmospheric entry without complete vaporization, providing a gentle, sustained infusion of biochemical precursors.

What is the advantage of fine cosmic dust delivery compared to a massive cometary impact concerning organic survival?
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