Here is a VERY interesting article that describes how comets could have brought the very building blocks of life to Earth in the form of impacts:
https://www.llnl.gov/news/newsreleases/2013/Jun/NR-13-06-02.html
Synthesis of prebiotic hydrocarbons in impacts of simple icy mixtures on early Earth.
It is also thought that comets brought the water to form our oceans.
Sky Guy in VA
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