William Rontgen
the scientist who came up with these theories are unknown
i dont no
Bohr-Rutherford
Isaac Newton
Newton.
I have no ideia
Archimedes
Alfred Wegener.
If they are calcified, such as an aorta that has plaque build up. Abdominal aortic aneurysms can sometimes be seen on xray in this situation. However, in general, arteries do not show up on xray.
Charles Darwin was the scientist that came up with the theory of Natural Selection.
Bohr-Rutherford
God came up with everything