Phytoplankton are microscopic plants (for example, diatoms) that are the base of the food chain in most of the ocean.
(Phytoplankton; are; microscopic plants (for example, diatoms) that are the base of the food chain in most of the ocean) (microscopic plants (for example; are; the base of the food chain in most of the ocean)
Phytoplankton microscopic plants (for example
are are
microscopic plants (for example, diatoms) that are the base of the food chain in most of the ocean
the base of the food chain in most of the ocean