Q: What is the main component of phytoplankton?


Read this paragraph and choose the correct option from the provided answers:

Algae play significant roles as producers in aquatic ecosystems. Microscopic forms live suspended in the water column. They are the main component of phytoplankton . As such, they contribute to the food base of most marine ecosystems.

 Choices:

- sponge

- coral

- seawater

- algae


A:
algae