Giraffes with short necks lived in arid regions. Over time, grasses disappeared, forcing giraffes to eat from trees. Mutations i
n the genome led to some giraffes inheriting the trait for long necks. Over time, there were more giraffes with long necks in the region. What are the two reasons for the change in the population of giraffes?
Natural selection is the phenomenon of the evolution in which the organisms able to fit in the changing environment survive while other organism died. Hence the survival if the fittest and then these organisms. Further reproduce to give birth organisms more fit to the changing environment.
The long neck giraffe survive but short neck died. So the population of long neck increased while short neck go extinct.
Other reason is the change of food resource. The food resource change from grass to long trees.
From the example of the Giraffes you can read that adaptation you can see that tehy adapted the lenght of their nexk in order to be able to reach food that was only available in the trees, so they had to make their necks longer, and then the giraffes that had the longest necks were the ones that were able to survive and get food, so they passed that treat to their offspring and with time only giraffes with longer necks were able to feed themselves, that´s natural selection.
