How can you tell if someone is heterozygous or homozygous for a trait that is dominant

How does the author's purpose in this passage differ from an author writing about her personal struggle living with asthma?

The chemical form of energy that is useable by the cell to do work

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.