A human has
2
12
23
46

pairs of chromosomes

What are the formed elements (cell or parts of cell) in blood and what are their functions ?

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 ?

How energy flows through each level in this energy pyramid. is all the matter and energy from one level transferred to the next level?