It is a convex lens. It is used to produced to see a magnified version of text i.e.
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Answer:
Seven hours after a nuclear explosion, residual radioactivity will have decreased to about 10 percent of its amount at 1 hour, and after another 48 hours it will have decreased to 1 percent.
Answer:
Lead to is the correct answer hope it helps.
Plot
is a chain of events that tells you what happens in the story