I believe that it’s unconscious since it’s not something you require to be aware of so therefor the answer should be D.
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.
Vertex presentations mean the fetus is head-down in the birth canal. The fetus' head is presenting first.
