2c) The most reasonable explanation for Gilder’s increase in population is Choice C: prosperous economy along with improved health care. The improved economy would explain the increased immigration and decreased emigration rates—that is, people would want to come to Gilder and do not want to leave, perhaps for job opportunities. A prosperous economy would lead to improved health care, which could explain the increased birth rates and decreased death rates.
The change in Gilders population could include factors like prosperous economy and improved healthcare. This is due to the fact that as the birth rates increase the death rates decrease. Improved healthcare has slowed down the death rate. Secondly, the prosperous economy contributes to amount of immigrants coming in and out of this country.
<span>(decreased variation in tail feather color because no form of the trait is advantageous) Due to the fact that the tail color is no longer a necessity, so it will eventually stop being needed and variation will decrease.</span>
