Answers

2016-02-11T22:57:42+05:30
(1) Implantation : It is the process of after fertilization the attachment of the ovum to the endometrium.

(11) Placenta : Placenta is the connection between mother and embryo. Placenta play the role of respiration, nourishment and excretion of the embryo.

(b) average duration of human pregnancy is 40 weeks.
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