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LenKa [72]
3 years ago
8

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

Biology
2 answers:
schepotkina [342]3 years ago
4 0

Answer:

The mass extinction that occurred 250 years ago and the mass extinction that   occurred 65 million years ago may have been caused due to gradual processes or due to the catastrophic effect.

The mass extinction that occurred 250 million years ago was caused to the sudden climatic change and lead to extinction of almost 95% of the population present at that time.

The extinction of dinosaur took place 65 million years ago due to the meteorite that hit the earth.                

Nitella [24]3 years ago
3 0
Or otherwise called (Natural selection)
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For case  study                                                  

Let 'a'  represent the total population of people with melanomia = 696                                                      

Let 'b' represent the total number of people with melanomia exposed to indoor tanning  =  1107 – 696 = 411 people

For  control study

Let 'c' represent the total population = 1500

Let 'd' represent the total number of people not exposed to indoor tanning = 1500 - (0.428 * 1500)

                                                          =  1500 - 723

Total number of people not exposed to indoor tanning   = 777 people

                                                       

a. Odds ratio = (a/b) / (d/c) = (696/411) / (777/723)

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b. Inasmuch the odds ratio is greater than 1, this means that higher odds of melanoma exist in people exposed to indoor tanning, than in those not exposed to indoor tanning.

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