Resource theories and pieces of cakes
Conversion between objects I would like to begin this article with a question. Is there a way to turn bread into sugar? The answer from biology is yes. $$\textrm{Bread} \xrightarrow{\text{chewing}} \textrm{Smaller pieces of bread}$$ $$\textrm{Smaller pieces of bread} \xrightarrow{\text{enzyme}} \textrm{Sugar}$$ The question of whether or not there is a way is different from the question of whether or not the way is practical. A practicality question may ask whether or not a person can do this. The answer is still yes. A person can chew bread with their teeth and amylose in their saliva can break down the starch in the bread into disaccharide sugar. However, if we ask whether or not a tree can do this, the answer may be different. Obviously, a tree cannot chew bread. A tree might have another way to turn bread into sugar, but it is not the same way as a human does. ...