i believe that it is chromosomes
Zane may be diagnosed with major depressive disorder.
When a person is depressed, they are feeling low all the time. They are not really interested in anything, and spend a lot of time sleeping because they don't see a point in doing anything else. This is what Zane is experiencing due to his depression.
The following that is a characteristic that could be applied to both living and nonliving things can contain mostly carbon, hydrogen, oxygen, and nitrogen.
