Why do epidemiologists use simulations to model disease transmission?

Are the earth's ocean floor and continents the same age geologically? why or why not?

Zoo geographic regions are characterized by the presence of specific groups of animals these regions are determined by the taxonomic or phylogenetic relationships of animals. the map shows the zoogeographic regions proposed by the naturalist alfred russel wallace in 1876. the similarities of organisms in which two areas numbered above provide the best evidence for common ancestry between the organisms in both locations ?

Which label correctly identifies what x represents in the concept map?