Suppose that the type of drink did not affect which can floated or sank. Maybe the
cans themselves were different in some way. Maybe something besides soda got into
one of the cans by mistake. Write down at least two possible factors that could have
caused the events.

Below is the answer.

Explanation:

There are different cans produced in the soda factory. Juice cans, soda bottles, packed items, and water bottles are produced.Juice bottles may have mixed with the soda cans by mistake.This type of drink will not affect the floating or sank liquid. Juices contain water and fruit flavors and they will be mixed and produced as juice.Each bottle will have a difference in its size. Some will be long and some will be short.

           

~potters6/te801/biology/biounits/respiration.htm

That would be a working theory.