External skeleton; a tough, waterproof outer covering that protects, supports, and helps prevent evaporation of water from the body of many invertebrates.

An internal skeleton; structural support system within the body of an animal.

List the eight main groups of invertebrates

Sponges, cnidarians, flatworms , roundworms, segmented worms, mollusks, arthropods, echinoderms.

Asymmetrical invertebrates, have specialized cells, no tissues or organs. Barrel sponge

Invertebrates that have stinging cells and take food into a central body cavity. Nigerians have radial symmetry. Don’t although they lack organs, they do have some tissues. An example is a jellyfish.

Long flat body that is soft ,reproduce by splitting in two and growing the missing piece, 2 way digestive system, eat like mushroom. An example of a flat worm is a tapeworm.

One way to digestive system. smooth, thin tubes. an example of a roundworm is a pinworm.

Long round bodies, have brain and organs, have multiple hearts, one way digestive system, have segments. An example of a segmented worm is an earthworm.

Invertebrates with soft, unsegmented bodies that are often protected by a hard shell.. All mollusks have a thin layer of tissue called a mantle that covers their internal organs and an organ called a foot. An example of a mollusk is scallops.

Invertebrates, that have hard outer coverings, segmented bodies, and pairs of jointed appendages. An example of a arthropod is a crab.

Invertebrate that has an internal skeleton and a system of fluid -filled tubes. Radial symmetry, use their system of tubes to move and obtain food and oxygen. An example of an echinoderm is a sea star.

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Chapter 4 lesson 3

Term	Definition
Exoskeleton	External skeleton; a tough, waterproof outer covering that protects, supports, and helps prevent evaporation of water from the body of many invertebrates.
Endoskeleton	An internal skeleton; structural support system within the body of an animal.
Share the basic definition of an invertebrate	An animal without a backbone
List the eight main groups of invertebrates	Sponges, cnidarians, flatworms , roundworms, segmented worms, mollusks, arthropods, echinoderms.
Sponges	Asymmetrical invertebrates, have specialized cells, no tissues or organs. Barrel sponge
Cnidarians	Invertebrates that have stinging cells and take food into a central body cavity. Nigerians have radial symmetry. Don’t although they lack organs, they do have some tissues. An example is a jellyfish.
Flatworms	Long flat body that is soft ,reproduce by splitting in two and growing the missing piece, 2 way digestive system, eat like mushroom. An example of a flat worm is a tapeworm.
Roundworms	One way to digestive system. smooth, thin tubes. an example of a roundworm is a pinworm.
Segmented worms	Long round bodies, have brain and organs, have multiple hearts, one way digestive system, have segments. An example of a segmented worm is an earthworm.
Mollusks	Invertebrates with soft, unsegmented bodies that are often protected by a hard shell.. All mollusks have a thin layer of tissue called a mantle that covers their internal organs and an organ called a foot. An example of a mollusk is scallops.
Arthropods	Invertebrates, that have hard outer coverings, segmented bodies, and pairs of jointed appendages. An example of a arthropod is a crab.
Echinoderms	Invertebrate that has an internal skeleton and a system of fluid -filled tubes. Radial symmetry, use their system of tubes to move and obtain food and oxygen. An example of an echinoderm is a sea star.

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