Reason: We will set up 4 containers for this experiment and measure the carbon dioxide levels in each. One container will have water only and no organism. Why is this an important container to have in our experiment?

A wooden splint that is used in an experiment is set on fire and held over a container of gas. The color of flame and amount of popping that the woodne splint does will tell you what type of gas is in the container. They test for different gaseous presences. Usually for oxygen, carbon dioxide or hydrogen.

Ifound this on google “what are motifs? a motif is a literary term that is an idea, object, or concept that repeats itself throughout a text. a motif gives clues to theme or reinforces ideas an author wants to emphasize.” i hope this for what your looking for