Consider a simple economy producing 2 goods: coffee and tvs. in 2014 the economy produced 2000 pounds of coffee and 10 tvs. in 2015 the economy produced 1000 pounds of coffee and 12 tvs. the price of one tv was $1,000 in both years while the price of coffee decreased from $6/pound in 2014 to $5/pound in 2015. based on this information the percentage change in real gdp in chained prices benchmarked to 2015 is: a. 22%b. 16.5%c. -16.5%d. -22.0%

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.