CAMPBELL BIOLOGY IN FOCUS-TEXT,AP ED.
CAMPBELL BIOLOGY IN FOCUS-TEXT,AP ED.
3rd Edition
ISBN: 9780136811206
Author: Urry
Publisher: SAVVAS L
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Chapter 36, Problem 5TYU
Summary Introduction

Introduction:

In humans, gestation (pregnancy) lasts about nine months or forty weeks. This time period is divided into three trimesters each three months long.

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