I think it would be the first ones with lower o2 because fish dont breathe oxygene
To answer this specific question,
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Answer: water, wind, volcanic rock, sand, and other stuff that can pile up basically.
The answer is “Trypanosoma”. The word “Trypanosoma” comes
from the Greek words trypanon and soma, which means auger and body, or auger
body. A Trypanosoma moves through an undulating membrane connected to a
flagellum. Trypanosoma comes from a genus of kinetoplastids, it is known to be
a monophyletic cluster of single-celled parasitic flagellate protozoa.
