The student performed an experiment to test his hypothesis about sunlight and plant height using two plants. He kept everything
the same between two tomato plants except he exposed them to different amounts of sunlight. He also used a third plant as a control group, or a group in which no variables are manipulated to confirm the results. Roberto critiqued the work. Which problem did Roberto most likely identify?
Not anywhere in the excerpt does it say that he is using trials and averaging the data. this trial could've been a flop, but he wouldn't know due to the lack of trials
<span>He needs to keep everything the same — or controlled — in the control group plant and the experimental plants, so that the only difference between the groups is the amount of sunlight that they get. </span>
Charles Darwin used domesticated animals to provide evidence for evolution by natural selection by showing "<span>Differences between breeds show that selection can cause species to change."</span>
