Aristotle sees the soul as distinct from the body, but dependent upon the body for it's existence. Also,
Aristotle sees the body as dependent for the soul for it's existence. A soul without a body is an
unintelligible concept to Aristotle, the biologist that he is. And, a body without a soul is also
unintelligible (that's a corpse, or just a big pile of earth, water, air, and fire — but not flesh).
Think of the Aristotelian body and soul as analogous to a husband and a wife in a marriage:
husbands need wives to be in marriages, and wives need husbands to be in marriages, husbands
cannot exist but in a marriage, and wives cannot exist but in a marriage. The same goes for the body
and the soul.