In the USA, raw sewage (e. g., wastewater from toilets and baths) poses a threat to public health and the health of ecosystems because it contains . Group of answer choices: a) high levels of ozone that can cause a lot of damage to plants and other living tissues b) very little organic nutrients and very little inorganic nutrients c) disease-causing microorganisms and organic and inorganic elements that can be used as nutrients for naturally-occuring microorganisms living in freshwater d) ecosystems aesbosteos fibers that can be ingested by living organisms lead and mercury.

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.

There's no options to. choose from

B.) nitrogen fixationnitrogen fixation is the process of nitrogen molecules seeping into the soil and inside plant roots and bacteria. it gives more "life" to plants