What is the central idea of " why do you have two lungs, but only have one heart"

Ultimately most animals developed a system of two lungs and one heart (along with the rest of their organs) because that's what was needed to survive and thrive on Earth. People didn't develop two hearts or eight legs or wings because we didn't need them for survival. And we developed two lungs because we need them.

Explanation:

This is why we live.

2nd person

hope this !

d) the narrator even suggested that the white whale, moby d, was ubiquitous and present in every ocean at every moment.