View Available Hint(s) Which statement regarding normal microbiota of the human respiratory system is FALSE? The upper respiratory tract is mostly sterile. The ciliary escalator in the bronchial tubes keeps the lower respiratory tract nearly sterile. Potentially pathogenic microorganisms are present in nonsterile portions of the respiratory tract but usually do not cause disease. The trachea normally may contain a few bacteria. Provide Feedback

What must be done to breed dogs for a partical trait

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 ?

Abody cell has been growing and at synthesis proteins.in the nucleus of this body cell,dna replication is taking place. and a copy of the cells genetic material is copied.which of the following is the best conclusion you can make about the life cycle of this cell ? a) the cell is ready to undergo mitosis.and a chemical signal will send the cell to prophase b)the cell is undergoing meiosis and will cross over the genetic material next c)the cell is in the s phase of interphase and will move next to the g2 phase d) the cell is in the g2 phase of the interphase and is ready to begin diving