A200- gram sample of a radioactive nuclide is left to decay for 30 hours. at the end of 30 hours only a 100 g of the sample is left. what is the half life of the nuclide sample

The spermists believed that: the male made the only hereditary contribution to the offspring the male and female traits were blended in the offspring the female made the only hereditary contribution to the offspring the male and the female made equal contributions to the next generation