Once nutrients are absorbed into the circulatory system, the next major organ they pass through is the .

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 animal is a producer in this ecosystem

Explain how paleontologists use trilobite fossils as index fossils for various geologic time periods.