There would be no birth defects from interbreeding in the beginning. GOD created Man perfect, that is DNA perfection. The reason that we get defects
today from interbreeding is DNA mutations and defects, these are things that the first creations didn't carry in their DNA. If you understand the way
a baby is made and the creation of a new human in the egg/sperm fertilization you would understand that offspring often carry the same genetic defects
of their parents. When the DNA strand splits and puts 23 chromosomes from each parent into the new human, if the parents both carry the same DNA they
would tend to give their offspring a double dose of that mutated/damaged gene code. Since Adam was created perfect and his DNA Code was perfect the
offspring wouldn't have carried any defects. Remember Adam lived for 936 years, that's a pretty good and perfect DNA code.
Cain married a sister and Adam and eve bore many offspring, possibly thousands of children. Cain was killed by GOD in the flood of Noah so no person
did kill Cain.
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