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Why has the exact limit of time during which an organism is an embryo not been precisely defined?

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However, since the young animal may undergo metamorphosis or may remain wholly dependent on the mother for some time after birth, and since the seedling derives nourishment from food stored in its fleshy cotyledons even after it has sprouted, the exact limit of the time during which an organism is an embryo has not generally been well defined.

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Similar questions: Why is the exact limit of time an organism remains an embryo still not defined? Has the exact limit of time an organism remains an embryo been precisely defined? [ Hide these questions ]

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