Which of the following is the distinguishing feature of prokaryotic cells? Prokaryotic cells have a nucleus.
Prokaryotic cells do not have a cell wall.
Prokaryotic cells do not have a nucleus.
Prokaryotic cells have mitochondria.

9. the history of life on earth is recorded in

What molecule contains an organisms genetic material, passed down from parents to their offspring

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.