Educational worksheet for Year 4 students to learn about the specific characteristics of vertebrates, including mammals, birds, fish, reptiles, and amphibians.

Let's solve this step by step based on the specific characteristics of vertebrates — mammals, birds, fish, reptiles, and amphibians.

We'll fill in the blanks for each group with accurate biological traits. Here's the completed table with explanations:

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Mammals

*(Examples: Lion, Whale)*

I) Breathe through lungs
→ Mammals breathe air using lungs. Even whales (marine mammals) come to the surface to breathe air.

II) Reproduce by giving birth to live young (or viviparous)
→ Most mammals give birth to live young (except monotremes like platypus, which lay eggs).

III) Body covered with hair or fur
→ Hair is a defining trait of mammals (e.g., lion’s fur, whale’s sparse hair).

IV) Live on land and water
→ Mammals can live in various habitats: land (lion), water (whale), air (bats), etc.

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Birds

*(Examples: Chicken, Eagle)*

I) Breathe through lungs
→ Birds have efficient lungs and air sacs for respiration.

II) Reproduce by laying eggs (oviparous)
→ All birds lay hard-shelled eggs.

III) Body covered with feathers
→ Feathers are unique to birds and help with flight and insulation.

IV) Live on land and air
→ Birds live on land and fly in the air; some also swim (e.g., penguins).

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Fish

*(Examples: Fish swimming in water)*

I) Breathe through gills
→ Fish extract oxygen from water using gills.

II) Reproduce by laying eggs (oviparous)
→ Most fish lay eggs in water.

III) Body covered with scales
→ Scales protect the body and reduce friction in water.

IV) Live on water
→ Fish are aquatic animals; they live in water (oceans, rivers, lakes).

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Reptiles

*(Examples: Snake, Turtle)*

I) Breathe through lungs
→ Reptiles breathe air using lungs throughout their life.

II) Reproduce by laying eggs (oviparous) or giving birth to live young (some species)
→ Most reptiles lay eggs (e.g., turtle), but some (like certain snakes) give birth to live young.

III) Body covered with scales
→ Dry, scaly skin prevents water loss.

IV) Live on land
→ Reptiles are primarily terrestrial; some live in water (e.g., turtles), but they still need to breathe air.

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Amphibians

*(Examples: Frog, Salamander)*

I) Breathe through lungs and skin (in adults), gills (in larvae)
→ Tadpoles use gills; adult frogs use lungs and absorb oxygen through moist skin.

II) Reproduce by laying eggs (oviparous)
→ Eggs are usually laid in water.

III) Body covered with moist, smooth skin
→ Their skin must stay moist to allow gas exchange.

IV) Live on both land and water
→ Amphibians spend part of their life in water (larval stage) and part on land (adult stage).

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✔ Final Answer Summary:

| Group | I) Breathe through | II) Reproduce by | III) Body covered with | IV) Live on |
|--------------|--------------------------|------------------------------|----------------------------|---------------------------|
| Mammals | Lungs | Giving birth to live young | Hair/fur | Land and water |
| Birds | Lungs | Laying eggs | Feathers | Land and air |
| Fish | Gills | Laying eggs | Scales | Water |
| Reptiles | Lungs | Laying eggs (mostly) | Scales | Land |
| Amphibians| Lungs and skin (adults), gills (larvae) | Laying eggs | Moist, smooth skin | Both land and water |

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✔ This classification helps students understand how vertebrates differ in structure, reproduction, and habitat. Let me know if you'd like a printable version!