Which statement could be a possible explanation for the drop in mercury concentration in the fish of
onondaga lake between the years 2002 and 2003?
(1) between 2000 and 2005, a large number of fish were sampled.
(2) the dumping of industrial waste was prohibited in 2004.
(3) more young fish were tested in 2003, compared to the other years.
(4) the industrial waste contained more mercury in 2004.

answer: carbon 14 can only be used to determine the age of the organisms that were once living, and igneous rocks are non living.

explanation:

carbon 14 dating is used to determine the age of the sample by estimating the amount of carbon 14 present in the sample and then comparing it with a reference standard.carbon 14 is a isotope of carbon which is radioactive and unstable. carbon 14 is assimilated by all plants and animals throughout their life from carbon dioxide. however, one the organisms die they stop this assimilation and the carbon 14 content starts to decrease.by knowing how much of carbon 14 is left in an organism after his death, one can estimate the age of the organism. the materials whose age can be estimated by carbon 14 method are the organic compounds. however, some inorganic compounds such as aragonite   shell can also be dated.however, if we consider the igneous rocks it is a non living component which never accumulated carbon 14 in it and thus, we cannot use carbon 14 dating method to estimate its age.

Of the cold they can survive in the cold