To fill:
The correct term in the given blank.
Introduction:
The mammals are the organisms that carry the babies in their wombs and give birth to the young ones. In initial days, the young ones are fed by the milk produced in the mammary glands of these organism.
Answer to Problem 1A
Placenta.
Explanation of Solution
The yolk is the yellow portion of the egg which give the nutrition to the developing embryo in the egg. Similarly, in mammals, the nutrition to the developing child is provided by the placenta. The placenta is a structure that connects the body of the mother to the fetus.
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Biology Illinois Edition (Glencoe Science)
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