What extraterrestrial evidence confirms that raw organic building blocks may have been delivered to early Earth?

Answer

Samples returned from asteroids like Ryugu confirming amino acids.

Samples returned from asteroids, such as those from the Hayabusa2 mission to Ryugu, have confirmed the presence of multiple types of amino acids, supporting the theory that raw ingredients were assembled off-world and delivered to Earth.

What extraterrestrial evidence confirms that raw organic building blocks may have been delivered to early Earth?
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