Final answer:
Carbonaceous chondrites formed about 4.5 billion years ago from the material in the solar nebula and are composed of organic molecules that may have contributed to life on Earth.
Step-by-step explanation:
Carbonaceous chondrites formed 4.5 billion years ago as the solar system was taking shape. They are a type of primitive meteorite composed of the initial materials from the solar nebula, including various complex organic molecules such as amino acids. These carbon-rich compounds are thought to be some of the building blocks of life, potentially delivered to Earth and other planets by these meteorites. Through detailed examination, it's found that these meteorites are primarily made of material that condensed out of a hot gas during the solar system's formation, representing some of the oldest materials within our solar system. The carbonaceous asteroids, from which these meteorites originated, are mostly located in the outer part of the asteroid belt.