As you sit on the beach, you notice that the breeze, which had been blowing toward the water from the land, shifts so that it is blowing off the water toward land. What event has just occurred? A. Clouds have begun to form over the water.
B. The temperature over the land has reached its highest point for that day.
C. The temperature over the land has become higher than the temperature over the water.
D. The temperature over the water has become higher than the temperature over the land.

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.