What are vestigial traits? what are homologous structures? what are analogous traits? can you explain these using the terms "adaptation" and "common ancestor"?

How many chromosomes are in a gold fish?

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 ?

Nh3 +02-no + h20 is unbalanced what is the balanced equation