The Correct choice is C
<u>Demography</u> is the study of human populations and how they grow or decline.
A student buries an ice cube in a pan of dirt and observes the dirt as the ice cube melts. This activity is a model of the formation of a kettle.
The answer you are looking for is "<span>a. elements of ecosystems are mutually dependent on each other ".</span>
A human instinct because our instinct is survival
During the medieval era the Catholic Church became a more elaborate heirachy. The pope became an image of of supreme power in Europe. There was also a large population growth. Towns and cities wanted more self control. This caused a political and social struggle.
This struggle caused a huge demand of a more direct experience with Christ. Christ and his apostles became an image of more radical simplicity. The church became made a huge impact in daily life. It served as a spiritual and religious guidance. The church also made an impact into Europe's government.
