the growth of planets began as sold bits of matter began to collide and clump together through a process known as accretion.
No. A planetesimal orbits a sun. A moon orbits a planet.
The same materials that formed the Earth.
They don't. Living beings are believed to have evolved much later.
The interaction of earth-orbiting and Sun-orbiting planetesimals (very large chunks of rocks like asteroids) early in the history of the Solar System led to their breakup. The Moon condensed from...