Microorganisms are small microscopic living organisms which are so small that they cannot be seen with unaided eyes. Viruses, bacteria, fungi , archaea, and protists are included in microorganisms. The microorganisms can be parasitic or free-living. Most of the microorganisms cause diseases in other living organisms.

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Definition Definition Organism that lives in the body of another organism and obtains food at the expense of the host. A parasite can directly or indirect harm the host. There are two kinds of parasites: internal and external. An internal parasite lives inside another organism and is known as an endoparasite. An external parasite lives on the body surface of the host and is known as an ectoparasite. Protozoa and helminths are examples of major human parasites.

Chapter 21, Problem 17MC

Summary Introduction

Introduction:

Microorganisms are small microscopic living organisms which are so small that they cannot be seen with unaided eyes. Viruses, bacteria, fungi, archaea, and protists are included in microorganisms. The microorganisms can be parasitic or free-living. Most of the microorganisms cause diseases in other living organisms.

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Definition Definition Organism that lives in the body of another organism and obtains food at the expense of the host. A parasite can directly or indirect harm the host. There are two kinds of parasites: internal and external. An internal parasite lives inside another organism and is known as an endoparasite. An external parasite lives on the body surface of the host and is known as an ectoparasite. Protozoa and helminths are examples of major human parasites.

Chapter 21, Problem 17MC

Summary Introduction

Introduction:

Microorganisms are small microscopic living organisms which are so small that they cannot be seen with unaided eyes. Viruses, bacteria, fungi, archaea, and protists are included in microorganisms. The microorganisms can be parasitic or free-living. Most of the microorganisms cause diseases in other living organisms.

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Answer 3

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Definition Definition Organism that lives in the body of another organism and obtains food at the expense of the host. A parasite can directly or indirect harm the host. There are two kinds of parasites: internal and external. An internal parasite lives inside another organism and is known as an endoparasite. An external parasite lives on the body surface of the host and is known as an ectoparasite. Protozoa and helminths are examples of major human parasites.

Chapter 21, Problem 17MC

Summary Introduction

Introduction:

Microorganisms are small microscopic living organisms which are so small that they cannot be seen with unaided eyes. Viruses, bacteria, fungi, archaea, and protists are included in microorganisms. The microorganisms can be parasitic or free-living. Most of the microorganisms cause diseases in other living organisms.

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Answer 4

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Definition Definition Organism that lives in the body of another organism and obtains food at the expense of the host. A parasite can directly or indirect harm the host. There are two kinds of parasites: internal and external. An internal parasite lives inside another organism and is known as an endoparasite. An external parasite lives on the body surface of the host and is known as an ectoparasite. Protozoa and helminths are examples of major human parasites.

Chapter 21, Problem 17MC

Summary Introduction