Asign on the beach states, "beach closed. red tide." the organisms interfering with your use of this beach are probably a sign on the beach states, "beach closed. red tide." the organisms interfering with your use of this beach are probably amoebas ciliates diatoms dinoflagellates species of red algae

The answer is “dinoflagellates”.

Dinoflagellates are a group single celled eukaryotes from the kingdom Protista. Dinoflagellates are often photosynthetic and can produce their own food by photosynthesis. Some dinoflagellates are parasitic. When there is a large number of dinoflagellates during the warmer seasons (also known as an “algal bloom”), the body of water will change into a rusty red color called red tide. Red tide occurs because dinoflagellates produce a neurotoxin called saxitoxin which manifests as paralysis. When humans eat affected fish, they will experience a non-specific syndrome with nausea and vomiting called ciguatera. On the other hand, when humans eat affected shellfish; then there will be paralysis, confusion, poor mental status, etc. and this is called paralytic shellfish poisoning.

d.

explanation: