PRIN. OF LIFE (LL)-W/ACHIEVE
PRIN. OF LIFE (LL)-W/ACHIEVE
3rd Edition
ISBN: 9781319492069
Author: HILLIS
Publisher: MAC HIGHER
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Chapter 35.4, Problem 2RA
Summary Introduction

To determine: The function of blood vessels that form in the yolk sac of birds.

Introduction: The yolk sac is formed by the extension of endoderm and mesoderm. The yolk sac is surrounded by these two layers.

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