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Elena L [17]
2 years ago
9

Explain why primary ecological succession takes a lot longer than secondary succession.

Biology
1 answer:
tamaranim1 [39]2 years ago
8 0

Answer:

Soil needs to be created

Explanation:

Primary succession takes longer than secondary succession because, soil needs to be created. Soil is already present in secondary succession. Lichens and erosion help divide the rock to form new soil.

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Which of the following best represents what is displayed in the image below? (4 points)
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Answer:

D

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A person's bone marrow produces red and white blood cells. Which of the following best describes how damage to a person's bone m
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How can you separate iron filings from sand through which process​
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Process called magnetic separation

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6 0
3 years ago
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You are conducting a case control study to determine if an association exists between melanoma and indoor tanning. From a statew
Aleksandr-060686 [28]

Answer:

a. Odds ratio = 1.58

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

Explanation:

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)

                                                = 1.69 / 1.07 = 1.58

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.

7 0
3 years ago
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