Dinoflagellates are large group of flagellate eukaryotes (multicellular organisms) that constitute the group dinoflagellata. Red tides is a common name for alga bloom (large concentrations of aquatic microorganisms ) which when caused by a few species of dinoflagellate and the bloom takes on a red or brown color. Therefore, the answer to the question is red tides.
Producers (plants) can turn the sun's energy into usable energy by photosynthesis. They are at the bottom of the food chain; all of our energy comes from them. :)
