Apopulation of lizards lives in an isolated area where local rocks contain a high concentration of radioactive elements. a study of this population would most likely show

Environmental  radioactivity   is produced by radioactive materials in the  human  environment . while some  radioisotopes , such as  strontium-90   (90 sr) and  technetium-99   (99 tc), are only found on  earth   as a result of human activity, and some, like  potassium-40   (40 k), are only present due to natural processes, a few isotopes,  e.g.  tritium   (3 h), result from both natural processes and human activities. the concentration and location of some natural isotopes, particularly  uranium-238   (238 u), can be affected by human activity.