The anatomical structures and physiological systems of squids and other cephalopods responsible for making them more active than other mollusks. Introduction: Mollusca is the second largest phylum of animal kingdom. They are soft-bodied, unsegmented animals covered with shell. Body is covered with head, a transparent skin covering body wall called mantle, and ventral foot. Mouth cavity consists of radula for rasping. Mantle secrets a calcareous external shell, which is the characteristic of this phylum. Some species may have internal shell as well. Respiration takes place through lungs or gills.

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Answer 1

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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 31.6, Problem 3SB

Summary Introduction

To review:

The anatomical structures and physiological systems of squids and other cephalopods responsible for making them more active than other mollusks.

Introduction:

Mollusca is the second largest phylum of animal kingdom. They are soft-bodied, unsegmented animals covered with shell. Body is covered with head, a transparent skin covering body wall called mantle, and ventral foot. Mouth cavity consists of radula for rasping. Mantle secrets a calcareous external shell, which is the characteristic of this phylum. Some species may have internal shell as well. Respiration takes place through lungs or gills.

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Answer 2

Question

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 31.6, Problem 3SB

Summary Introduction

To review:

The anatomical structures and physiological systems of squids and other cephalopods responsible for making them more active than other mollusks.

Introduction:

Mollusca is the second largest phylum of animal kingdom. They are soft-bodied, unsegmented animals covered with shell. Body is covered with head, a transparent skin covering body wall called mantle, and ventral foot. Mouth cavity consists of radula for rasping. Mantle secrets a calcareous external shell, which is the characteristic of this phylum. Some species may have internal shell as well. Respiration takes place through lungs or gills.

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Answer 3

Question

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 31.6, Problem 3SB

Summary Introduction

To review:

The anatomical structures and physiological systems of squids and other cephalopods responsible for making them more active than other mollusks.

Introduction:

Mollusca is the second largest phylum of animal kingdom. They are soft-bodied, unsegmented animals covered with shell. Body is covered with head, a transparent skin covering body wall called mantle, and ventral foot. Mouth cavity consists of radula for rasping. Mantle secrets a calcareous external shell, which is the characteristic of this phylum. Some species may have internal shell as well. Respiration takes place through lungs or gills.

Expert Solution & Answer

Want to see the full answer?

Check out a sample textbook solution

See solution

Answer 4

Question

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 31.6, Problem 3SB

Summary Introduction