A marine biologist is investigating the sudden deaths of marine mammals in association with a HAB in Monterey Bay. Upon examination of a sea water sample, she notices that the color has a distinctive brownish hue. Upon microscopic examination, she find millions of single-celled organisms, some clumping in colonies and other living freely. Biochemical analysis confirms high amounts of silica and leucosin. Which of the following taxonomic groups most likely is causing the HAB? Domain Bacteria Domain Archaea (shiylum Apicomplexa Phyium Bacillariuphyta Phylum Dinoflagellata Phylum Phaeophvea Phylum Rhodaphices..