Answer:
Science fiction assumes that the universe bursts with life, but scientists aren't so sure.
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.
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Answer:
I think the best answer would be he died of an unknown illness because Mr. Summers is referring to a man that is Watson. Normally people refer "head" of the family as the man. And since his mother is assumed she's alone, she has a man to do the work. I don't think I explained this properly but I hope it helps! :)
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