What percentage of the carbon atoms second energy level is filled?

Athermometer is placed in water in order to measure the water’s temperature. what would cause the liquid in the thermometer to rise?

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 two criteria must be met before scientist can use radiocarbon dating? explain your answer