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invertebratesTRANSCRIPT
Invertebrates
What is an invertebrate?
Invertebrates don’t have a backbone.
They are usually smaller than vertebrates.
All invertebrates are oviparous.
Most animals on earth are invertebrates.
Some live on land and others live in the soil.
Some live in water.
Some can fly.
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What do invertebrates eat?
Not all invertebrates eat the same food.
Some eat only plants.
They are herbivores.
Some eat only other animals.
They are carnivores.
Some eat plants and animals.
They are omnivores.
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Classifying invertebratesIt is more difficult to classify invertebrates
because there are so many groups.The most important groups are:
Molluscs
Anthropods
Worms
Jellyfish
Sponges
Starfish
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MolluscsMollusks have a soft,
muscular body.
Some, like snails, have a shell.
Many molluscs live in the sea.
Mussels, oysters and octopuses are all molluscs.
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AnthropodsAnthropods are the
biggest group of invertebrates.
Their bodies are divided into 3 parts.
They have a hard skin and joints in their legs.
Insects (ants and bees) and arachnids (spiders and scorpions) are anthropods.
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WormsWorms have a
long, soft body.
Some live on land and others live in water.
Some worms are parasites. They live inside another animal and feed on them.
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Jellyfish
Jellyfish live in water.
They have soft bodies and tentacles.
Be careful! Their tentacles can sting you!
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SpongesSponges have
soft bodies covered with holes.
They live in water.
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Starfish
Starfish are protected by hard outer parts.
They live in water.
They usually have 5 arms, but some can have even 20!