Dinoflagellates are best described as
◦ parasitic diatoms that must spend part of their life cycles in vertebrate hosts.
◦ large, multicellular algae that resemble plants but do not have true leaves, stems, or roots.
◦ protozoans that use cilia to move and feed.
◦ a clade of protists including unicellular autotrophs, heterotrophs, and mixotrophs