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The Heavily Cratered Lunar Highlands Speak to Us of an Early

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The heavily cratered lunar highlands speak to us of an early epoch in the history of the solar system when cratering was much more common than it is today; the present population of interplanetary debris fails by a large factor to account for the abundance of the highland craters. (Carl Sagan, Broca's Brain: Reflections on the Romance of Science)
This statement is made up of a(n) _____ and a(n) _____.


A) nonargument; report
B) argument; conclusion: The present population of interplanetary debris fails by a large factor to account for the abundance of the highland craters
C) nonargument; explanation
D) argument; conclusion: The heavily cratered lunar highlands speak to us of an early epoch in the history of the solar system when cratering was much more common than it is today

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