What energy source's harmful effects did the development of the ozone layer protect early organic life from?
A) x-rays
B) ultraviolet radiation
C) radioactivity
D) lightning
Correct Answer:
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Q9: Which statement best characterizes the term mutation?
A) A
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Q11: Most of the individuals in a bat
Q12: Which statement best describes how the Earth's
Q13: What is the definition of gene pool?
A) the
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