Use hypothesis, controlled experiments and variable in the same sentence

john wanted to do a controlled experiment to prove a classic theory, he had a hypothesis in which the bacteria would grow based on how hot was the petri dish that they were living in was. to limit the amount of variable he used the same sample of bacteria and the same petri dish for each trial.

i do not know and i have a 100 in this class

primary succession begins with a bare rock and ends with a forest secondary succession begins after a natural disaster where there is a temporary setback after a forest fire or local destruction, but the surrounding area can fill in