That body parts are called "Homologous Organs" which are similar in origin & structure.
Hope this helps!
The smallest unit of matter that has the characteristic properties of it’s element is called an “atom”.
Individual atoms are called “elements” for that reason.
There are smaller divisions of matter, however those no longer have the characteristics of the element that they may be a part of. A hydrogen electron is indistinguishable from an argon electron, or any other.
Gene (DNA) expression would be B
