Read information about the West Nile virus and its effect on the bird population in the state you live in. If your state has not been affected yet, choose another state that has. In your state, how many birds have tested positive for West Nile virus? Estimate what percentage of the total resident bird population this number represents.

Based on the data in your tables, did the light-colored moths have a higher or lower survival rate after the industrial revolution?

Which locations on the map are low-pressure areas? a b c d e

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.