A P. Bursaria cell that has lost its zoochlorellae is aposymbiotic. If aposymbiotic cells have population growth rates the same as those of healthy, zoochlorella-containing P. bursaria in well-lit environments with plenty of prey items, then such an observation eould be consistent with which type of relationship?A) toxicB) mutualisticC) commensalisticD) predator-preyE) paras

Option B, Mutualistic relationship

Explanation:

The relationship between two organism where each organism gets benefitted from the association is known as mutualistic relationship  

Zoochlorellae benefits their host by providing them essential nutrients and oxygen by using the waste containing nitrogen, phosphorus and carbon dioxide.  

Paramecium bursaria benefits the algae  Zoochlorellae  by providing them  protection and also enable them to move.  

They exhibit mutualistic endosymbiotic relationship

Hence, option B is correct