Jun 29th, 2015
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Alamance Community College
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MODE OF RESPIRATION -Some are aerobic, requiring oxygen to survive -Some are anaerobic, do not need oxygen to survive -Some can live in the presence or absence of oxygen

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Species have become extinct throughout geological history. Biologicalevolution, driven by natural climate change, catastrophic geologic events, andcompetitionfrom better-adapted species, has involved extinction of billions of species since the advent of life on Earth about three billion years ago. In fact, according to the fossil record, only 24% of the species that have existed on Earth exist today. In modern times, however, species threatened by human activities are becoming extinct at aratethat far exceeds the pace of extinction throughout most of geologic history. (The mass

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