Briefly explain how photosynthesis and cellular respiration form a continuous cycle

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 ?

If animal agriculture was eliminated, how much grain would become available for human consumption?

Which of the following is a testable hypotheses?