A-level Biology

A-level Biology
ISBN-10
0199140898
ISBN-13
9780199140893
Category
Biology
Pages
570
Language
English
Published
1989
Authors
W. D. Phillips, T. J. Chilton

Description

In humans , birth normally occurs from 38 to 42 weeks after conception , with an average around 40 weeks . A series of uterine movements , hours , days or even weeks before parturition , prepare the foetus for delivery , manipulating it ...

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