What is the process where rocks gas and dust collided to form the planets in our solar system including earth

Accretion is the process where rocks, gas, and dust collided to form the planets in our solar system including earth.

Accretion is the process in which particles such as dusts, gases, and rocks are accumulated in an accretion disk under the influence of gravitation to form massive objects. This process bring about the formation of most astronomical objects, such as stars, planets, and galaxies.

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not necessarily. higher fitness requires the organism to be reproductive successful. for example, an organism at age 10 with 15 offspring is much more fit than an organism at age 15 with only 5 offspring.