Terry is teaching his class about atoll reefs. Which of these points should Terry mention in his explanation?

1) that atoll reefs are the oldest
2) that atoll reefs border the shorelines
3) that atoll reefs generally have a lagoon between the shoreline and the reefs
4) that atoll reefs are the youngest

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 ?