Answer:
A. Genetic predispositions.
Explanation:
It is known as a genetic predisposition to the way in which the genetic phenotype of an organism influences an individual or a population. The phenotype is the genetic load that differs from one organism to another and that is usually modified by the environmental conditions to which the population is exposed.
In this case, Donna and Derek have phenotypes that react differently to sun exposure, which is why their skin burns to a greater or lesser intensity. It is very likely that Donna's ancestors came from a hot environment where they were frequently exposed to the sun, while Derek's ancestors were from a colder environment where there was less exposure to the sun.
The genetic phenotype can also define the probability that an individual or population has of having a disease or having certain physical characteristics.
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4 - The Spanish bought over diseases they were immune to however these were new to the Native Americans and their bodies didn't have the antibodies to deal with them.
<span>Synesthesia is a perceptual phenomenon in which stimulation of one sensory or cognitive pathway leads to automatic, involuntary experiences in a second sensory or cognitive pathway.People who report a lifelong history of such experiences are known as synesthetes.Carlos experiences red when he hears a particular tone. he is most likely experiencing a condition known as synesthesia</span>
Answer:
The mean center of the population of the United States shifted to the South and West as workers migrated to areas with more jobs and a warmer climate.
Explanation:
The migration of skilled workers leads to greater economic growth in the region. Children get better opportunities for higher education. The population density is reduced and the birth rate decreases.
The economic experience of the 1950s and 1960s – rapid economic growth with relatively closed borders – cannot be repeated today because there are fewer underutilized Southerners, Puerto Ricans, and women who could enter the workforce as substitutes for immigrants. Teenagers, some of the unemployed, and others who have dropped out of the labor force could provide some growth in the number of workers but nowhere near enough to substantially increase the number of hours worked and make up for relatively low growth in the other factors of production. Immigrants did not crowd out many American migrants. The substitution of southern and Puerto Rican migrants petered out sometime between 1960 and 1970 before international immigration could substitute and at a time when the percentage of immigrants was the lowest ever recorded in American history. Immigration restrictions face a trade-off between more restrictive immigration and economic growth that they should be weighing more carefully than they currently do.
The Nile separated the country into <span>the upper Egypt that was located between first Nile cataract and the Nile delta, and the Lower Egypt that started from the Nile Delta to the Mediterranean.</span>