Stars, other than the Sun, are too far away from Earth to be studied by space probes. How are scientists able to study the composition of a star that is located outside of the Solar System? A.
by evaluating the mass, density, and volume of the star
B.
by evaluating the kinds of sounds given off by the star
C.
by evaluating the different colors of light radiated by the star
D.
by evaluating the air pressure in the atmosphere of the star

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.