47. what is necessary for differentiation to occur in a planet? a. it must be made of metal and rock. b. it must be made of a mix of materials of different density. c. material inside must be able to flow. d. all of the above e. b and c

e. B and C

Explanation:

When the sun ignited in our solar system evaporation of the material closest to the sun took place. The low density material were pushed further. The rocks that remained formed the protoplanets. As, the early solar system was very hot parts of the protoplanets melted. This caused the melted material to flow towards the center of the planet. As the mass of the planet increases this causes more accretion which causes materials of different densities to mix.

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probably not if net force is zero