what does the bible say?
Biogenesis refers to the production of life from life. In contrast, the production of life from non-living matter is abiogenesis. Abiogenesis has never happened naturally; there are no accepted models for how it could happen in a laboratory or elsewhere. Biogenesis occurs constantly, from the division of bacteria, to trees shedding seeds, to cows calving.
Biogenesis is also different from creation ex nihilo, which refers to God’s forming something supernaturally out of nothing (Genesis 1:1). In biogenesis, living creatures form more of their own kind, with possible slight variations, through a natural reproduction process. In creation ex nihilo, God produces something that never existed in any form or in any components. God didn’t make the universe from preexisting building blocks. He started from scratch, but the world continued to populate through biogenesis.