The large, globular structure at the base of the flagellum in male mosquitoes is called organ, and responds to vibrations induced by sound.

Agene pool: a) is the collection of all the alleles found in a single species b) is the collection of all the alleles found in a single population c) is the collection of all the chromosomes found in a single population d) is the collection of genes in a species that allow the individuals to swim