Based on all we know about the terrestrial worlds,what single factor appears to play the most important role in a terrestrial planet's geological destiny?

Question

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The size of a terrestrial planet plays the most important role in its geological destiny because it determines the planet's ability to retain heat, which in turn affects its geological activity, including volcanism, tectonics, and the maintenance of an atmosphere.

Based on All We Know About the Terrestrial Worlds,what Single