The document discusses the five main groups of vertebrates: mammals, birds, amphibians, reptiles, and fish. It provides additional details about mammals, noting that they are viviparous, give birth to live young that feed on milk from their mothers' breasts. It specifies that whales, dolphins, and sharks are examples of marine mammals that live in water but breathe air through lungs. The document also mentions that birds breathe through lungs and lay eggs from which their offspring hatch, while fish breathe through gills and live exclusively in water, either freshwater or saltwater.

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2. The vertebrates are characterized
for having a skeleton full of bones that support his body.
The vertebrates divide in five groups:
-Mammals
-Birds
- Amphibious
- Reptiles
-Fish
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The mammals are VIVIPAROUS.
The babies grow inside the mother up to his birth and feed
of the milk that his mothers produce in the breasts.

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There are mammals that live always in the sea, though they
breathe for lungs.
His skin is smooth.
Whales, sharks and dolphins
are marine mammals
They live in the water diving and they have to go out to
the surface to breathe.

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The birds breathe for lungs.
The birds are oviparous,
the babies are born of the eggs
that his mothers put

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The fish are aquatic animals
that live in the water
and that they breathe for gills.
Some of them live in sweet water
and others in salty water

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