Are all MARVEL super heroes all nuclear or scientific made?

Answer 1

No, some are natural mutations (e.g. The X-Men and, some would argue, the Inhumans), some are hybrids from other species (e.g. Blade, who is part vampire), some are aliens or derive their power from an alien source (Captain Marvel, both Mar-Vell and his successor Ms. Marvel, Hulkling and the Silver Surfer) and some derive their powers from magic (e.g. Dr Stephen Strange).