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Unit: Introduction to College Reading and Writing
Progress
Question DOS328
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Read the following paragraph, which is missing a topic sentence:
According to the "rare Earth hypothesis," the conditions that support life on Earth are unique, and the odds of similar
conditions being found on another planet are close to zero. In contrast, the "mediocrity principle” holds that our planet, solar
system, and galaxy are utterly ordinary, making it likely that life is common elsewhere.
Which is the most effective topic sentence for the paragraph?
Have you ever looked up at the stars and wondered if anyone was out there looking back?
Science fiction assumes that the universe bursts with life, but scientists aren't so sure.
Despite many decades of searching with telescopes, space probes, and planetary rovers, we have found no evidence of
extraterrestrial life.
There are two opposing viewpoints on the possibility of life existing on other planets.

Answer 1

Science fiction assumes that the universe bursts with life, but scientists aren't so sure.

Step-by-step explanation:

According to the given paragraph about the low probability of finding life in other planets or galaxies, the most effective topic sentence for the paragraph is Science fiction assumes that the universe bursts with life, but scientists aren't so sure.

This is because, a topic sentence is a brief statement of the main point of an essay.