why did Eve have to have a rib from Adam and all of the the other animals were just created?
(1) God wanted her to be modest.
"I will not create her from the head for she may carry herself haughtily; nor from the eye for she may be too inquisitive; nor from the ear, for she may be an eavesdropper, nor from the mouth for she may be too talkative; nor from the heart for she may be too jealous; nor from the hand for she may be too acquisitive; nor from the foot for she may be a gadabout. I will create her from a hidden part of the body that she may be modest." - taken from rabbinic sermon from the Middle Ages
(2) Some Jews associated bone properties with (patriarchal definitions of) femininity.
"Man is easier to pacify than woman because he is made from a clod rather than from a bone. Water will soften a clod at once, whereas a bone will remain hard even after being soaked in water for days. Another Jewish tradition explains why only woman needs perfumes. Man is made from dust which does not increase in odor no matter how long it is kept, but woman is made from a flesh-covered bone which will soon reek if not sprinkled with spices."
(3) Puts her in her place in relation to man
It was right for the woman to be made from a rib of man ... to signify the social union of man and woman; for the woman should neither use authority over man, and so she was not made from his head; nor was it right for her to be subject to man's contempt as his slave, and so she was not made from his feet.- Thomas Aquinas Summa Theologica, 1, q. 92, 3
that she should be made of a rib taken from under his arm, to show that she ought to be under the hand and guidance of her husband 19 - Francis de Sales, Introduction to the Devout Life, 3, 38.
(4) Puts her nearest to man's heart (whoever wrote that, either felt the pinch of misogyny or they needed some from their wives)
Adam, in Paradise Lost, speaks endearingly of the formation of his "other half": "Out of my side to thee, nearest my heart." - John Milton, Paradise Lost, 4, 11. 484 and 488
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Points roughly summarised from Theology Today article, Adam's Rib: Bone of Contentionby William E. Phipps
INQ