The Animal Kingdom (II). Vertebrates
There are around 50000 species of vertebrates, classified into five main groups: fish, amphibians, reptiles, birds and mammals. Fish are the most primitive group and they have the highest number of species. They are aquatic vertebrates. Amphibians were the first vertebrates to colonise the land. Later, reptiles developed an egg with a shell. This allowed them to diversify and live on land. Dinosaurs were reptiles. [...]
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91 recursos
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Secuencia didáctica
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Didactic objectives To know the general morphological characteristics of vertebrates and the groups included. Compare, differentiate and describe various specimens of fish, amphibians, reptiles,birds and mammals using classification tables. [...]
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1. Fish Fish are perfectly adapted to aquatic life. There are two main groups of fish: bony fish and cartilaginous fish. Most fish are bony fish such as hake, salmon and trout. Sharks and manta rays are examples of cartilaginous fish. [...]
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There are around 50000 species of vertebrates, classified into five main groups: fish, amphibians, reptiles, birds and mammals. Fish are the most primitive group and they have the highest number of species. They are aquatic vertebrates. [...]
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1.1 Characteristics of fish Fish are perfectly adapted to aquatic life. They are the most numerous and diverse group of vertebrates. There are two main groups of fish: bony fish and cartilaginous fish. [...]
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2.1. Characteristics of amphibians Amphibians were the first vertebrates to colonise land, even though they still depended on water to reproduce. Amphibians can be divided into two groups: Anurans do not have a tail. They are frogs and toads. [...]
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3.1. Reptiles: adapting to the land Reptiles were the first vertebrates to adapt to land and become independent of water. Some examples are lizards, snakes and tortoises. Their main adaptations to life on land are: A waterproof body. [...]
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4.1. Characteristics of birds Birds have some very distinct features: Their body is covered in feathers, which stop heat being lost through the skin. They are bipeds. On the ground they stand on their legs. These are covered in scales. [...]
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5.1. Mammal's bodies Mammals have the following characteristics: Baby mammals feed for a time on their mother's milk, that is, they are suckling offspring. Their mouths have lips that help them to suck the milk produced by the adult females. [...]
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Mammals occupy all kinds of habitats. They live in forests, deserts, oceans and seas and mountains. Some examples include rodents, insectivores, bats, cetaceans, ungulates, carnivores and primates.
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There are around 50000 species of vertebrates, classified into five main groups: fish, amphibians, reptiles, birds and mammals. Fish are the most primitive group and they have the highest number of species. They are aquatic vertebrates. [...]
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There are around 50000 species of vertebrates, classified into five main groups: fish, amphibians, reptiles, birds and mammals. Fish are the most primitive group and they have the highest number of species. They are aquatic vertebrates. [...]
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