NS 3º U3 L2 Invertebrates Groups 1-2 - Contenido educativo
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invertebrates. In this case, we are starting lesson number two. Groups of
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invertebrates one and two. First of all, how many groups of invertebrates are
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there? There are six groups of invertebrates. One, arthropods. Two, mollusks.
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In this lesson, we are focusing on two groups. Group number one, arthropods.
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Group number two, mollusks. Group number one, arthropods. Arthropods have a
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segmented body and limbs. Remember that limbs include arms and legs. Arthropods
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have an exoskeleton. An exoskeleton is an external protection or armor. There are
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four groups of arthropods. Arthropods, one, are insects. For example, this bee.
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Insects, like bees, are arthropods. They have a head, a thorax, an abdomen, six legs,
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two antennae, and some of them also have wings. Arthropods number two, arachnids.
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Arachnids, like spiders, are also arthropods. They have a head and thorax,
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an abdomen, and eight legs. Arthropods three, crustaceans. Crustaceans, like crabs,
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are arthropods. They have two eyes, four antennae, two claws, eight legs, and a carapace or shell
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to protect themselves. Arthropods number four, myriapods. Myriapods, like centipedes,
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are also arthropods. They have two antennae, many, many segments, and a lot of legs.
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Group number two, mollusks. Mollusks have a soft body. Some mollusks, like slugs or snails,
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have a shell for protection. Other mollusks, like octopuses, have tentacles.
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Okay, let's now continue with the three different groups of mollusks. Remember that mollusks have
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a soft body. There are three groups of mollusks, gastropods, cephalopods, and bivalves. Let's
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explain group number one, gastropods. They have two antennae with eyes. Some have a shell for
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protection, and they can live on land or in water. Group number two are cephalopods. They have a
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large head with tentacles. Some also have a shell for protection, and they live in water. Some use
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camouflage to protect themselves. Group number three are bivalves. Some have two shells for
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protection, and they live in water.
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- Idioma/s:
- Autor/es:
- Fernando García
- Subido por:
- Fernando G.
- Licencia:
- Reconocimiento - No comercial - Sin obra derivada
- Visualizaciones:
- 71
- Fecha:
- 17 de enero de 2024 - 14:57
- Visibilidad:
- Clave
- Centro:
- CP INF-PRI IPLACEA
- Duración:
- 04′ 33″
- Relación de aspecto:
- 1.78:1
- Resolución:
- 1092x614 píxeles
- Tamaño:
- 16.85 MBytes
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