Question

complete the passage with the words that make the most sense. supernovas apogees molecules calderas the life cycle of a star is a complex process shaped by its mass. for particularly massive stars, this cycle culminates in dramatic that scatter heavy elements like lead and uranium across the cosmos. these elements mix with interstellar gas and dust, eventually coalescing into new stars and planetary systems. some scientists speculate that essential organic may have formed in these vast stellar nurseries and later been delivered to different planets via comets or meteorites. over billions of years, these dynamic processes contribute to the formation of new celestial bodies and the building blocks of life.

Explanation:

For the first blank, "supernovas" (explosions of massive stars) fit as they scatter heavy elements. For the second blank, "molecules" (organic molecules are relevant to the building blocks of life) make sense. "Apogees" relate to orbital highest points, "calderas" are volcanic features, so they don't fit.

Answer:

First blank: supernovas
Second blank: molecules