It depends on which Adam and Eve you mean.
The Adam and Eve of the Garden likely didn't have fingers, hands, torsos or any other physical part or attribute. The biggest clue to this is the fact that God said Adam and Eve would die on the day they ate of the forbidden fruit. But did they literally, physically die? Not at all. In fact, they were escorted out of the Garden.
Could the escorting be a symbol for death -- spiritual death? Was the Garden only a spiritual place? Were the physical attributes described merely and only metaphor for something else?
Another clue is the fact that the Tree of Life mentioned in Genesis 3 is also mentioned in the Jewish Kabbalah, only this tree is a pattern or template of concepts -- understanding, wisdom, kindness, beauty, etc. I suspect that the Tree of Knowledge of good and evil is another such non-physical tree -- a tree of dichotomies -- good-evil, wisdom-stupidity, compassion-indifference, confidence-doubt and others.
In fact, the Jewish Kabbalah's Tree of Life has been discovered embedded in two books of Genesis.
Thus, the forbidden fruit (product or end result) of the Tree of Knowledge may be a matrix of dichotomies. And perhaps this matrix is something we call "ego" -- the source of all selfishness and ignorance.
The Adam of Genesis 5 is different. This Adam is described in Genesis 5:2 as both male and female and as plural -- a "them." Here Adam is all of early humanity -- the earliest tribe. This Adam is a group. And the individual members of this group have navels, certainly.
What's interesting about the wisdom hidden in Genesis is that it includes a timeline compatible with those of science. It places earliest humanity (Adam) at 10,434,130 BC. All of the supposed ancestors of Homo sapiens were not even born 10.4 million years ago. Perhaps humans were created instead of evolved, after all. But created from nothing, or created by a genetic engineer? We may never know this.