The number of bubbles in your experiment might be different ... the pondweed to get used to the more distant light. Then get counting the oxygen bubbles again. Do this again from 30 cm away.

FOR an experiment designed to help us find evidence ... manipulate potassium atoms to extremely low temperatures, when tiny bubbles should form spontaneously, we will have a proxy for the ...

The number of bubbles in your experiment might be different ... the pondweed to get used to the more distant light. Then get counting the oxygen bubbles again. Do this again from 30 cm away.