Necessity

ne•ces•sity noun
1 [U] ~ (for sth)| ~ (of sth / of doing sth)| ~ (to do sth) the fact that sth must happen or be done; the need for sth: We recognize the necessity for a written agreement.
2 [C] a thing that you must have and cannot manage without.
3 [C, usually sing.] a situation that must happen and that cannot be avoided.

The more we look around, the less necessity we found.

Mortality might be one.

Everybody can be anything.