Phytoplankton is the smallest total biomass
Photic Zone
What's known as a Cascade Effect would occur. Any species that feeds on the Phytoplankton and Zooplankton would become extinct. The filter-feeders would most likely be killed first, then the species that eats filter-feeders and so on. Most, if not all, sea life will be eradicated and leave us with no sushi.
phytoplankton provide most of the oxygen to earth.
No phytoplankton would have to be plants and dinoflagellates are animals and if regarded as part of the plankton would need to be called zoo-plankton.
phytoplankton
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Virus
they would most likely have web feet
Answer is The epipelagic zone
Sexual reproduction is possible in phytoplankton, although cells most often reproduce asexually by splitting in two.
diatoms