Does anyone have the answers for honors biology semester 2 final exam and all are multiple choice questions (there are 44 questions)

Genetic disorders can result when sister chromatids fail to seperate properly. during what phase is this problem most likely to occur?

Which animal is a producer in this ecosystem

Which of the following is a reason why early living organisms on earth could not have survived on the surface? 1. the lack of an ozone layer 2. the lack of oxygen in the atmosphere 3. the fact that these organisms were single-celled