The human respiratory system intakes oxygen which is transported to all parts of the body by the circulatory system. then, the circulatory
system returns deoxygenated blood to the respiratory system.
at what level of organization does this interaction occur?

Which part of the cell is affected by the movement of molecules through diffusion, osmosis and active transport?

Female luna moths (actias luna) attract males by emitting chemical signals that spread through the air. a male hundreds of meters away can detect these molecules and fly toward their source. the sensory organs responsible for this behavior are the comblike antennae visible in the photograph shown here. each filament of an antenna is equipped with thousands of receptor cells that detect the sex attractant. based on what you learned in this chapter, propose a hypothesis to account for the ability of the male moth to detect a specific molecule in the presence of many other molecules in the air. what predictions does your hypothesis make? design an experiment to test one of these predictions.

How would you expect the mrna codons that code for the amino acids that make up hemoglobin to compare between humans