Select the scientific questions that are testable.
How many people live in an area
prone to earthquake?
To what extent has climate changed
over the past 100 years?
What career should I pursue after
graduate?
What gives a person's life meaning?
What gases make up the
atmosphere of Earth?
Should the use of coal and other
fossil fuels be banned?
What are the effects of high winds
during a hurricane?
How long does it take water to
freeze?
Why should we value the
environment?
Should mining for phosphates be
stopped?

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.