Task: Sentence Expansion
Input (English): Algal blooms are often green , but they can also be other colors such as yellow-brown or red , depending on the species of algae .
Output (English): The photosynthetic pigments in the algal cells determine the color of the algal bloom , and are thus often a greenish color , but they can also be a wide variety of other colors such as yellow , brown or red , depending on the species of algae and the type of pigments contained therein .