Why are red tides caused and why are they harmful ?

Explanation

### Step-by-Step Solution:

1. **Understanding Red Tides**: Red tides are a phenomenon that occurs in marine environments, characterized by the discoloration of seawater due to the rapid growth of certain microorganisms.

2. **Role of Dinoflagellates**: The primary organisms responsible for red tides are dinoflagellates, which are a type of single-celled eukaryotes found in the Protista kingdom.

3. **Rapid Multiplication**: Under favorable environmental conditions (such as increased nutrients, warm temperatures, and sunlight), dinoflagellates can undergo rapid multiplication, leading to a significant increase in their population density.

...