BIOLOGY: ESSENTIALS >LL< W/ CONNECT
BIOLOGY: ESSENTIALS >LL< W/ CONNECT
3rd Edition
ISBN: 9781260635379
Author: Hoefnagels
Publisher: MCG
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Chapter 29, Problem 1WIO
Summary Introduction

To explain:

The observation that lymphoid tissues are present in the stomach, skin, lungs, and intestines.

Introduction:

Pathogens also called as disease-causing agents include bacteria, protists, viruses, fungi, and worms. These organisms can infect different organs and have different entry points. So it is important for the body to have diverse and widely spread defense mechanism. The defense mechanism in animals includes different cells, tissues, and organs.

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