Answer:
Populations have variation in traits due to random mutation, crossing over and environmental conditions.
This process is a technique of osmosis. Osmosis is the movement of solvent particles. For example, water along its concentration gradient, from high to low concentration, via a semi-permeable membrane is changing the structure of the molecules in the potato strips.
Since the environment of the potato strips are in a sugar concentrate, the potato will lose its water content and so loses weight and the strips will be thinner and dryer.
