Nature. How is it that my brother and I are so different yet we were raised by the same parents. I assume we grew up with different natural instincts. One other difference were his friends and mines. Friends play a big part in nurturing us. His friends were not the greatest role models but he chose his friends due to his nature. Like I said we grew up with the same parents but due to his nature he rebeled everything they said and I didn't. So I believe nature leads to nurture.