An isolated african canyon community in which cheetahs and leopards consume only impala antelopes is being observed. if the number of leopards increases, which change is most likely to be the first to occur after the leopard population increase?
a) the impala population will decrease.
b) the cheetah population will increase.
c) the cheetah population will decrease.
d) the impala population will remain the same.

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.