Final answer:
Dinoflagellates are not known as protozoans because they perform photosynthesis and have distinct pigment colors.
Step-by-step explanation:
Dinoflagellates are not known as protozoans because:
- They perform photosynthesis
- They have a red pigment
- They have a yellow-gold color
Dinoflagellates are a group of protists that exhibit extensive morphological diversity and can be both photosynthetic and heterotrophic. While they share some similarities with protozoans, such as having flagella, their ability to perform photosynthesis and their unique pigment colors distinguish them from typical protozoans.