Answer:
C. The evolution of many species from a single ancestor over a long period of time
I believe the answer is b hope this helps
the radiations that are used to treat cancers are of the gamma type. primarily emitted from cobalt-60 (a radioactive isotope). and it is more controlled than other radiation exposures. i.e. solar radiation which is not controlled.
hope that this helps.
A because if they build a mall there the bear have no where to live and they would die out.
