Which of the following are actual mutualistic partnerships that involve a protist and a host organism?

Which of the following are actual mutualistic partnerships that involve a protist and a host organism? 






A) cellulose-digesting gut protists?wood-eating termites
B) dinoflagellates?reef-building coral animals
C) Trichomonas?humans
D) algae?certain foraminiferans
E) all except that involving humans




Answer: E


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