What is the smallest unit of matter that has characteristic properties of its element?

ATOM is the smallest unit of an element that still has all the properties of that substance

The smallest unit of matter that has characteristic properties of its element is an atom.

Hope I helped!!

the father in the first generation probably had the recessive colorblind trait in his x chromosome. if he and his wife both had the colorblind trait, even if she had 1 recessive and 1 dominant, then that trait would be passed on to their kids.

(since you didn't attach the family tree this is just an assumption)

answer; ///(b) it is composed of four protein chains and four heme groups;