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Every living thing has a place suited to it. Genesis 1 tells us that God separated the waters from the sky before creating fish and birds to inhabit them. List of the days of creation in order.
Day 1: Light and Dark
Day 2: Sky
Day 3: Land, Oceans, Plants
Day 4: Sun, Moon, Stars
Day 5: Fish and Birds
Day 6: Animals and Humans
Day 7: God rested