In which stage of materials of meiosis do the sister chromatids separate and move to opposite pole cell?

Environmental impacts on evolution : mastery test

Ascience research group is testing a new type of plant food. one trial is conducted in a controlled experiment. the data from the trial show that the plant that received the new food grew faster than the control plant. the group announces that the new plant food makes plants grow faster. what is the main weakness in this scientific claim?

In general, characteristics that an organism survive and reproduce become more common in a population over time. what mechanism of evolution cause this change?