are the factors that would have rendered my investigation invalid, and the steps I took to minimise them
             Heat pollution and Variations in temperature
             Description: If there is a significant amount of I.R. radiation emitted from the source of light or any other stationary source, it is possible that the maggots respond to this rather than the visible light stimulus. Also the temperature in the lab varies from day to day, and throughout the day.
             Steps taken to minimise it: Measured the temperature every 10 minutes to check whether it varies. I also made sure I completed the experiment on the same day as the temperature could have changed drastically from one day to the next.
             Description: If stray light of considerable intensity reaches the maggots, they m
             ...