Retired football players are _____ times more likely to die of neurodegenerative brain damage than the general public
a. three
b. four
c. five
d. six
e. ten
ANSWER: a
Biology & Microbiology
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When did life first appear on the planet?
A. 2.1 billion years ago B. 3.5 billion years ago C. 2.1 million years ago D. 3.5 million years ago
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An exceptionally rich fossil deposit is known as a(n) ________
Fill in the blank(s) with correct word
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Cryptochrome absorbs blue light. Indicate whether the statement is true or false
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