Because it displays the number of organisms at each tropic level.
Answer:
The most underappreciated job is a janitor/garbage men.
Explanation:
Janitors/garbage men help keep our earth clean.
There was a situation with the milk disappearing. Later at the end, it is revealed that the pigs took the milk. This is important because it shows that the pigs are not sharing everything with the rest of the animal which goes against their principles and because it shows a tendency to behave as Jones had behaved.