Which of the following rows identifies the expected relative concentrations of PCBs in the tissues of three of the organisms shown in the food web above?Row Low PCB Concentrations Moderate PCB Concentrations High PCB ConcentrationsA. Beluga Whale Arctic Cod Polar Bear B. Arctic Cod Zooplankton Phytophlankton C. Arctic Cod Harbour Seal Polar Bear D. Beluga Whale Thick-billed murre Walrus

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Microbes

Microbes are microscopic living organisms that can only be detected with the help of specialized laboratory equipment called a microscope. These living organisms are so small that they are not visible to the naked eye.