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?
O 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.
O Have you ever looked up at the stars and wondered if anyone was out there looking back

After reading the given paragraph, the most effective topic sentence for the paragraph will be, ''Despite many decades of searching with telescopes, space probes, and planetary rovers, we have found no evidence of extraterrestrial life.'' Therefore, the option B holds true.

What is the significance of an appropriate topic sentence?

An appropriate topic sentence is referred to or considered as such a sentence that fits as a title or topic of the sentence. Moreover, a topic sentence gives a brief description of the central idea or theme of the entire excerpt.

The title sentence used above appropriately describes and suits the central idea or theme of the contents mentioned under the paragraph as aforementioned. Moreover, it also describes the missing information from the paragraph.

Therefore, the option B holds true regarding the significance of an appropriate topic sentence.

Learn more about topic sentence here:

https://brainly.com/question/28037945

#SPJ5