Please help this is an emergency

What is used to keep track of the gamates and possible offsprings combination

In general, characteristics that an organism survive and reproduce become more common over time. what mechanism of evolution causes this?

Ronald wants to see if a new shower cleaner works better in removing soap than his old cleaner. he uses the new cleaner on one half of the shower tiles and his old cleaner on the other half. identify the independent and dependent variables in this experiment. enter your answer in the space provided.