If some living things do not reproduce this could be considered a defect or a genetic mutation in those people. If we take humans for example, if most humans reproduce and some don't because they cannot (if a guy cannot produce sperm) this doesn't mean that he isn't alive, it just means he was born with a genetic mutation which doesn't allow him to produce sperm needed for reproducing.
Check your other post I gave examples
Answer:
People differ in the amounts of sleep and rest needed.
Explanation:
You did not elaborate. This was all I could think of.
