Discuss the modes of development of mammals.
Mammals exhibit diverse modes of development, reflecting their evolutionary adaptations to different ecological niches. Their reproductive strategies are generally classified into three major categories based on the structure and function of their reproductive systems: monotremes, marsupials, and placentals. These modes of development are distinguished by differences in gestation, embryonic development, and parental care.
Monotremes are egg-laying mammals, a primitive group that includes species such as the platypus and echidnas. In monotremes, fertilization is internal, but the development of the embryo begins outside the mother’s body within a shelled egg. The eggs have leathery shells and contain enough ____ __________ ___ _____ ___ _________ _____ ____ _______ _________ ____ ___.
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