no
Asteroids are their own class of object.
Asteroids can fall on any planet (or moon).
No. The asteroids can be seen as leftovers from the formation of the solar system.
Yes. Asteroids can hit any planet.
By accretion
None of the planets are asteroids.
For sure. All the planets were bombarded by asteroids in the early formation of the solar system
gravity
Orbits of the planets Mars and Jupiter are closest to the region of asteroids.
ProtoplanetsCometsDustetc.
Asteroids are rocky or metallic bodies that orbit the Sun and are leftovers from the early formation of the solar system. They are not the remains of a broken planet because the gravitational forces during planet formation prevent such a catastrophic breakup. Additionally, the total mass of all known asteroids is relatively small compared to the mass of a planet, making it unlikely that asteroids are the remnants of a shattered planet.
Meteroids or comets can impact on a planet.