Final answer:
The Miller-Urey and meteorite hypotheses propose extraterrestrial sources for life's origin on Earth, while the nebular hypothesis focuses on solar system formation.
Explanation:
The Miller-Urey hypothesis and the meteorite hypothesis propose how life began on Earth by suggesting that organic molecules arrived on the planet through extraterrestrial sources such as comets, meteorites, and asteroids. These hypotheses argue that life's building blocks were brought to Earth through space impacts. On the other hand, the nebular hypothesis focuses on the formation of the solar system and does not directly address the origin of life, making it the correct option as NOT proposing how life began on Earth.
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