Is there such a computer software that would allow me to construct a human?

Like an image, not a REAL person.

I'm doing something for school. I was going to use whatever people I found on the internet to suit my needs, but I began to wonder… is there a program in which I could kind of make a person? Height, weight, mass/muscle, skin tone, you know all those important things?

I've wondered this a few times before. I just think it would be neat to make a person.

If not, I understand. If so, I don't care the price, I must have it O.O!