The answer is either A, the bottleneck effect or C, natural selection. The answer is most likely A because it is hinted that the predator fish was placed in the isolated stream. The predators eating the darters less than 5cm is natural selection though.
The difference between pH 3 and pH 4 is a 10 fold difference in the concentration of H+
Explanation: XX because she is female. Since she is not color blind one of the pair has to be XC. Since she is a carrier of color blindness she has to have the recessive gene as well, so the other has to be Xc.
The answer, I believe, would be C) A decrease in the wolf population - because the prey decreases, fewer wolves will be able to find food, which will lead to a decrease in their population.
