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Hello boys and girls, welcome to a new natural science lesson, in this case, Natural Science Unit 3, Lesson 3, Groups of Invertebrates 3, 4, 5 and 6.

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Remember that there are 6 groups of invertebrates, arthropods, mollusks, echinoderms, annelids, cnidarians and sponges.

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Today we are learning about echinoderms, annelids, cnidarians.

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Group 3, echinoderms.

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Echinoderms have a hard, spiky skin.

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As you can see, this starfish has a hard and spiky skin.

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Echinoderms live on the sea floor.

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Group number 4.

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Annelids.

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Annelids have a soft body and moist skin.

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Remember, fish and amphibians also have a moist skin, but they are vertebrates.

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Annelids can live on land, in water or in fish.

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Or inside other animals.

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Group number 5.

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Cnidarians.

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Cnidarians have a jelly-like body and tentacles.

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Cnidarians live in the sea.

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Group number 6.

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Sponges.

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Sponges can be...

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There are two different types of sponges.

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On the one side, smooth like a feather and mushy like a muffin.

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On the other hand, rough, hard and prickly.

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Sponges live in water.

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Sponges cannot move around.

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What type of invertebrate is this?

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It is a starfish.

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And what group does it belong to?

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Echinoderm.

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What about these jellyfish?

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Do you know the group jellyfish belong to?

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Cnidarians.

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That's right.

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What about these?

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These are marine sponges and they belong to...

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Sponges.

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And finally, these earthworms belong to the group of...

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Annelids.

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Thank you very much for listening.

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Bye.