AP BIOLOGY

Detailed explanation-1: -Scientists confirmed in 1971 that the Murchison meteorite contained amino acids, primarily glycine, and that those organic compounds likely came from outer space (SN: 3/20/71, p. 195). In the decades since, amino acids and other chemical precursors to life have been uncovered in other fallen space rocks.

Detailed explanation-2: -The new find suggests that amino acids may have been delivered to Earth on asteroids like Ryugu, reports Stephen Luntz for IFL Science. Previous research supports this idea because molecules on Ryugu were also found on meteorites that landed on Earth 3.3-billion years ago, Gizmodo reports.

Detailed explanation-3: -The Oparin-Haldane hypothesis, Miller-Urey experiment, and RNA world.

Detailed explanation-4: -Essentially, the hypothesis is that volatile-rich asteroids and comets would have released a large fraction of their volatiles directly into the atmosphere when they impacted Earth (e.g., see Kasting, 1990, 2004).