Biology
Biology, 02.08.2019 19:00, bommat1085

Which of the following statements is true? only a few species have become extinct in the past 500 years. there have only been two mass extinctions in earth's history. the worst mass extinction was the most recent involving the dinosaurs. scientists believe human destruction of the environment is causing another mass extinction.

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Biology, 22.06.2019 20:30, tyhe
Our planet has experienced five major extinctions in the four billion year history of life. the first, 450 million years ago, occurred shortly after the evolution of the first land-based plants and 100 million years after the cambrian explosion. the second extinction occurred 350 million years ago, causing the formation of coal forests. next earth experienced two mass extinctions during the triassic period, between 250 and 200 million years ago. the fifth mass extinction occurred 65 million years ago, ending the reptilian dominance of the earth. according to richard leakey, the sixth mass extinction is happening right now. leakey suggests that we, the human race, are the cause. each year, at our hand, approximately 50,000 species vanish from earth. he believes that man is destroying earth at a rate comparable with the impact of a giant asteroid. leakey's statistics indicate that 50% of earth's species will become extinct within the next 100 years assuming leakey's hypothesis of a sixth mass extinction to be true, how will we expect the model to change? a) a sharp spike in the graph approximately 100 million years from now b) a dip in the graph, followed by a sharp spike about 100 million years from now c) a sharp spike in the graph immediately following the "0" location of the x axis d) a plateau following the "0" mark on the x axis, followed by a gradual rise to a new peak
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Biology, 28.07.2019 22:00, sosojake4974
Today, the rate of extinction of species surpasses the great mass extinctions of the geologic past, and the largest number of extinctions can be traced to
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Biology, 30.07.2019 02:30, Nov25
Over the past 500 million years, mass extinctions have occurred in which at least of the species on earth became extinct.
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Biology, 25.08.2019 01:50, arlabbe0606
Species are going extinct at a faster rate than at any other time in history, with the exception of the five major mass extinctions. the graph below compares the number of recorded species extinctions to the human population. analyze this data in terms of speciation and extinction.
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