Which of the following is an environmental problem associated with abandoned coal mines? A
Thermal pollution of streams in the area
B
Acid drainage due to leaching of spoil heaps by rainwater
с
Air pollution caused by smog from ozone formation
D Alkaline solutions that pollute streams
E
Released nutrients that cause eutrophication into streams

B

Explanation:

The mutation rate in mutations/locus/generation equals 0.000014 or 1.4 x 10⁻⁵

Explanation:

From a total of 420.000 births, only 12 of these children born with this disorder, so:

420.000 total of newborns 100%

12 dwarf newborns X = 0.0028%

But this percentage corresponds to a period of two years. In one year, or one generation, the percentage would be:

2 years 0.0028%

1 year X= (1 x 0.0028)/2 =  0.0014%  

Which means that the mutation rate in mutations/locus/generation equals 0.000014 or 1.4 x 10⁻⁵