Introduction

Prenatal development of mammals can be divided into ovum, embryonic, and fetal phases. The fetal phase represents over 80% of the prenatal period, and extends from the embryonic phase until birth. The fetal period begins when the specific species becomes identifiable. At the onset of the fetal phase, organs and systems are identifiable, but varying extents of tissue differentiation and development occur during the fetal period. The majority of the prenatal increase in body size and maturation of tissues and organs characterizes the fetal phase.

How To Bolster Your Immune System

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