"Eve is “the mother of all living” (Genesis 3:20) because subsequent generations descended from her, not from a wider population of earlier humans.
Adam’s genealogy in Genesis 5 begins with quotations of Genesis 1 (Day 6), which shows that Day 6 included Adam’s origin.
The rationale for the Fourth Commandment leaves no room for Adam and Eve
to have been created after Creation Week, given that God made all that is in heaven and earth “in six days” (Exodus 20:11) and He finished all His work by Day 7 (Genesis 2:1–2).
Jesus placed the timing of Abel’s murder at “the foundation of the world” (Luke 11:50–51), which means the six-day creation cannot be pushed back eons before Abel’s parents, Adam and Eve.
The Apostle Paul explicitly called Adam “the first man”, in contrast with Jesus “the last Adam” (1 Corinthians 15:45).
He did not merely mean that Adam was the first of the two men under
consideration (as does verse 47 where the contrast is with Christ, “the
second man”). The context of verse 45 indicates that Adam was the first
of all men. Paul also told the Athenians that all nations came from one man (Acts 17:26)." CMI