The theory of endosymbiosis suggests that the ancestors of mitochondria were a) formed due an error in cytokinesis. b) once free-living heterotrophic prokaryotic cells. c) parasitic cells that lived within more complex organisms. d) once free-living cells that remained joined after mitosis.

Explain why process 2 is so important to sexual reproduction identify processes 1 and 3 state one difference between the cells produced by process 1 and cells produced by process 3

Construct at least two possible hypotheses for the student’s experiment.

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.