The difference between leavened and unleavened bread is found in the word itself - leaven. Leaven is what is placed in bread dough to make the bread rise. It is placed in the dough and spreads throughout the entire lump.
The census of those on the ark included Noah, Shem, Ham, and Japheth, Noah’s wife, and the three wives of his sons (Genesis 7:13). With these four men and four women, the earth was repopulated after the flood.
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