Space is filled with nothing.
Space is the absence of matter.
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The development of adaptive traits is a result of natural selection, one of the main mechanisms underlying evolutionary change.
Understanding natural selection is also becoming more and more important in real-world settings, such as resource management, agriculture, and medicine. Even among people with postsecondary physical education, studies show that natural selection is generally very poorly understood.
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Answer:
any of numerous complex proteins that are produced by living cells and catalyze specific biochemical reactions at body temperatures
