Question 3 of 10 The graph shows the percentages of different types of lightbulbs shipped to
consumers in North America over three years.
Percentages of Lightbulbs Sold Annually
to Residents in North America, by Type
2015
2014
Halogen
Incandescent
Compact fluorescent
(CFL)
Light-emitting diode
(LED)
2013
0% 10% 20% 30% 40% 50% 60% 70%
Fluorescent
The demand for which kind of lightbulb has decreased during this time

Based on the observation that only male crickets produce a song, you hypothesize that a male's song is a form of communication to potential mates. you set up a simple experiment to test this hypothesis. in the laboratory, you place a male snowy tree cricket in enclosure a, which is adjacent to enclosureb. in enclosure b, you place other insects, one at a time, and observe their responses to the male's song. the enclosures are designed so that the two insects being tested cannot see or smell each other, but sound is transmitted from enclosure a to enclosureb.