(C) Tertiary egg membranes are typically absent in most mammals. However,they are present in $Prototherians$ (monotremes). These membranes are secrete

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(C) Tertiary egg membranes are typically absent in most mammals. However,they are present in $Prototherians$ (monotremes). These membranes are secreted by the oviduct or accessory female reproductive organs after fertilization,similar to the shell formation in birds and reptiles.