When should a bar graph be used?
a. when the independent variable is continuous and does not show a relationship to the dependent variable.
b. when there is no independent variable.
c. when the independent variable is continuous and shows a causal link to the dependent variable.
d. when the independent variable is composed of categories and does not show a relationship.

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 ?