Based upon the data, which of the following best describes the effect on the timing of cicada emergence if the cottonwood ground cover decreases from 50 percent to 25 percent?
a. cicadas will emerge approximately 2 days earlier.
b. cicadas will emerge approximately 10 days later.
c. cicadas will emerge approximately 2 days later.
d. cicadas will emerge approximately 10 days earlier.

B. Cicadas will emerge approximately 10 days earlier

Explanation:

B. Cicadas will emerge approximately 10 days earlier

Because, ground cover of cottonwood trees decrease the soil temperature so, cicadas will emerge approx. 10 days later. When ground cover of cottonwood trees is decreased, the soil temperature will increase therefore, cicadas will emerge 10 days earlier. This is based on the table provided in the question that is when tree is un burned, cicadas emerged at July 15th and when tree is burned, cicadas emerged at July 3rd.

some of your causes might be acidic rain or natural wildfires that cause the parks to be degraded

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this is true, assuming that the allele is completely recessive and incomplete dominance is not a factor.