What is the function of amniotic fluid? How are substances exchanged between the embryonic and maternal blood?

Amniotic fluid serves crucial functions during the development of vertebrates, particularly in mammals. Its primary roles include providing a protective environment for the developing embryo, facilitating fetal movement, preventing desiccation, and _________ _______ _____ ___ _________ __________ ____ _________ _________ ________.
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