only respiration (and not photosynthesis) can occur in a dark bottle. respiration rate is the decrease in do over time.

It is important to be ethical in conducting the scientific method so that:

1. You do not disrespect the equipment given. For example, in many dissections, such as frog dissections, frogs give their lives just for your education. You should not play around with the frogs, but rather respect the frog and do your work so that the purpose is served.

2. To ensure equipment and utensils are properly used.

3. You do not want to ruin the scientific process and have to start it all over again and pay extra money.