Besides being important primary producers, and therefore an important part of the food chain, dinoflagellates are also known for producing nasty toxins, particularly when they occur in large numbers, called " red tides " because the cells are so abundant they make the water change colour.
(the cells; are; so abundant they make the water change colour) (they; make; the water change colour) (dinoflagellates; for producing; nasty toxins)
the cells they dinoflagellates
are make for producing
so abundant they make the water change colour
the water change colour
nasty toxins