Why was Roentgen's discovery of x-rays an accident?

a. He was trying to discover sound waves, not x-rays.
b. He had poor eyesight, making it hard for him to see anything in the dark
lab.
c. He was working alone and most discoveries are made in collaboration with
other scientists.
d. He was interested in experimental physics, not in inventing a tool to be used
in medicine.


d

Language Arts & World Languages

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You can make your pronoun references clear by doing all of the following except:

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Language Arts & World Languages