Question

What causes a red tide? a. fast reproduction of dinoflagellates d. toxins in shellfish b. an algal bloom e. parasitic protists c. red photosythetic pigments

Answer 1

Explanation:

Red tides are a common name for algal blooms, which are large concentrations of aquatic microorganisms, such as protozoans and unicellular algae (e.g. dinoflagellates and diatoms).[citation needed] The upwelling of nutrients from the sea floor, often following massive storms, provides for the algae and triggers bloom events. Harmful algal blooms can occur worldwide, and natural cycles can vary regionally.[1]

Answer 2

Answer:

xplanation:A red tide occurs when the population of certain kinds of algae known as dinoflagellates explodes, creating what's called an "algal bloom." Scientists sometimes refer to red tides as harmful algal blooms or HABs.