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Welcome to the Unit 3 of Natural Science.

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In this unit we are going to learn about animals and the different groups of animals.

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We have two big groups, vertebrates and invertebrates.

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The vertebrates have bones, do you remember what is a bone?

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Or also a spine or a fist, ok?

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The invertebrates, they don't have any bone.

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Inside the vertebrates, we have several groups of different animals, okay?

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For example, we have the mamas.

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The mamas are the only animals that are born from the tummy of the mamas, okay?

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The others are born from the eggs.

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we have mammals we have birds we have trees reptiles and amphibians an example of a normal

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maybe a lion an elephant the humans the birds okay we have for example a parrot a eagle

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fish, the shark, the crab fish, the ursula, all the fish, okay? Reptiles, for example a snake,

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a crocodile, a lizard, amphibians, like the frog, okay? And now we are going to see how

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are the bodies covered? In the case of mamas, they have fur. In the case of birds, they

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have feathers. The fish and the reptiles, their body are covered with scales. The amphibians

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have the burnt skin they have nothing it's like very very soft skin now let's

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go with the invertebrates the invertebrates they don't have bones and there are

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well we are going to see only three videos more or less inside worms, molluscs

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there are others but with these are enough for today and how are they body

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covers. We are going to see three types of body covering for invertebrates. We have the soft skin,

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sorry, the soft body. He has a soft body for example, the worm, the spider, the bee. Now,

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Now, the second is the exoskeleton. For example, a scorpion, a lobster, a grasshopper. They have, like, it's hard outside. That is an exoskeleton.

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And then we have the cell. He has a cell, a snail, a muscle, okay? The cell is this, okay?