In 1771, joseph priestly conducted an experiment where he put a living mint spring into a glass container with a lit candle. this container was then closed so that air could not escape or enter. once inside the closed container, the candle burned for a certain period of time, and then went out. after approximately one month, priestly attempted to re-light the candle inside the closed container using a mirror to focus sunlight onto the wick. he was successful in lighting the candle again using this approach. what do the results of this specific experiment allow you to conclude about plants?