Biology

Biology, 13.07.2019 00:00, lanakay2006

The mass extinctions that occurred 250 million years ago and 65 million years ago may have been due to gradual processes or

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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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Chemistry, 06.10.2019 22:00, bisolad64

Question 1(multiple choice worth 4 points) (02.03 lc) a scientist studied four rock fossils that show evolution of the modern-day horse dating back to 35 million years, 15 million years, 8 million years, and 1 million years ago. which rock fossil is most similar to the modern-day horse? 35 million years 15 million years 8 million years 1 million years

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Biology, 12.10.2019 08:30, starsapphire627

The mass extinctions that occurred 250 million years ago and 65 million years ago may have been due to gradual process or?

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Biology, 19.10.2019 22:30, zubeenakhtar1386

Mass extinctions occurred 250 million years ago and 65 million years ago. according to some scientists, which of the following reasons caused both mass extinctions? the earth’s oceans changed a few degrees in temperature. the diversity in the gene pool decreased dramatically. a new species was introduced into an established ecosystem. a large comet or asteroid hit the earth.

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