If all you Christians believe every word in the Bible, then where did all the animals on earth come from?

I see you only listen to your Sunday School Teacher and never read the Bible for yourself. Noah took ever clean animal by sevens and the unclean by twos male and female. Noah only sacrificed one of each one of the clean animals. Genesis 7:2 Of every clean beast thou shalt take to thee by sevens, the male and his female: and of beasts that are not clean by two, the male and his female. Genesis 7:3 Of fowls also of the air by sevens, the male and the female; to keep seed alive upon the face of all the earth. Genesis 8:20 And Noah builded an altar unto the LORD; and took of every clean beast, and of every clean fowl, and offered burnt offerings on the altar.