I need help with these two ( the ones that don't have a highlight on and its not answered ).

Ais a group of individuals of the same that exist together in the same place at the same time

Sarah and john are having a discussion on genetic diversity sarah believes it happens over a long period of time john believes it happens immediately who is correct

Males of different species of the fruit fly drosophila that live in the same parts of the hawaiian islands have different elaborate courtship rituals. these rituals involve fighting other males and making stylized movements that attract females. what type of reproductive isolation does this represent?