Lipid, which is a naturally occurring molecule.
Answer:
I'll say it's selfishness and a lack of empathy
Explanation:
The only thing that would stop humans from being compassionate to others and helping them would be selfishness and lack of empathy.
This is because, humans mostly do things for their benefit and without empathy they fail to understand what the other person is passing through
<span>McCourt is using allusion</span>
