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-Removed-Q: Where did the iron in our bodies come from?
A: The LORD God formed man of the dust of the ground and breathed into his nostrils the breath of life; and man became a living soul. Genesis 2:9
Q: So where did the the iron in the earth come from which God used to create humans and other life, if the earth is only 6,000 years old?
A: The only way to answer that is to go back in time and find out, and I don't think technology has advanced that far.
The tone of your posts and questions here suggest to me that yours is not a genuine search for scriptural knowledge, but rather a genuine quest to delegitimize God's inspired word. While you've been less than successful so far, I'm sure you will eventually succeed in finding items in the bible that would seem to contradict others. The problem with this is while you might win the debate, you're setting yourself up to lose in the long run.
Then Jesus told him, “Because you have seen me, you have believed; blessed are those who have not seen and yet have believed.” John: 20-29