BIOLOGY:ESSENTIALS NSU (LL)-W/ACCESS
BIOLOGY:ESSENTIALS NSU (LL)-W/ACCESS
3rd Edition
ISBN: 9781265143862
Author: Hoefnagels
Publisher: MCGRAW-HILL HIGHER EDUCATION
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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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