The 1st organism in a food chain must always be what type of organism?

Environmental differences within ecosystems are generally caused by

What macromolecule is produced during translation? a. carbohydrate b. rna c. dna d. protein

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 ?