There are so many relationships exist like parasitism, commensalism, mutualism (it means when two organism are in association these are very common type of relationship exist). But if we look at mother and fetus they also having a relationship but I could not find in which category to put it or call it.
According to my understanding, these terms are used for relationship between organisms of two different species for survival of one or both. However, mother-fetus relationship is to make survival or propagation of same species which we may say is a type of parental care.
Very interesting question, I must say. I think this relation may involve all the relationships you have stated but at different levels of the life of the fetus though I am not sure about mutualism. Symbiosis is more evident at fetus stage especially in the last trimester where most structures have been developed and both organisms live together. Whereas I can refer to it as being parasitic at the embryological stage to 2nd trimester of fetal stage because at this time, the embryo relies heavily on the mother for nutrients etc required for development which sometimes cause the mother to be sick. It becomes mutualistic in cases where the mother experiences benefits in how she is treated during pregnancy although I am not sure if there is a scientific or biological benefit that the mother has from carrying the fetus.
But this organism based relationship is unique since one part is always benefited while the another one is lower hand.
Compared to parasitism where both species belong to different group in mother-fetus relationship both comes within the same species.
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