Scientists theorized that all ecosystems need sunlight as an energy source. What has been discovered on the ocean floor that has challenged this theory?
A
ecosystems based around hydrothermal vents that rely on the vents' heat and chemicals for energy
B) ecosystems that get their energy from nuclear energy sources found on the ocean floor
ecosystems that rely on energy from bottom-feeding fish
D ecosystems that do not need any energy source

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.

Its incorrect i just took the quiz and it turned out to be wrong