Here are the solutions to the homework problems shown in the worksheet.
4. Differences between vertebrate and invertebrate animals
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Vertebrates: Have a backbone (spine) and an internal skeleton. They usually have a complex nervous system with a brain. Examples include humans, dogs, and birds.
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Invertebrates: Do not have a backbone. Many have a hard outer shell (exoskeleton) or soft bodies. Examples include insects, worms, and jellyfish.
5. Complete the chart
| Feature | Fish | Amphibians | Reptiles | Birds | Mammals |
| :--- | :--- | :--- | :--- | :--- | :--- |
|
They breathe through | Gills | Lungs and skin | Lungs | Lungs | Lungs |
|
Their body is covered with | Scales | Smooth, moist skin | Dry scales | Feathers | Hair or fur |
|
Their limbs are | Fins | Legs (usually 4) | Legs (usually 4) | Wings and legs | Legs (usually 4) / Arms & legs |
|
Their reproduction is | Laying eggs (mostly) | Laying eggs (in water) | Laying eggs (on land) | Laying eggs (hard shell) | Giving birth to live young |
6. Match
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Jellyfish image matches with
jellyfish.
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Spider image matches with
arthropod.
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Snail image matches with
mollusc.
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Worm image matches with
earthworm.
7. Label the parts of the insect
*(Based on the lines pointing to the mosquito diagram)*
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Top Left Box: Antennae
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Middle Left Box: Thorax
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Bottom Left Box: Abdomen
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Top Right Box: Head
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Middle Right Box: Wing
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Bottom Right Box: Leg
Final Answer:
4. Vertebrates have backbones; invertebrates do not.
5. See the completed chart above for breathing methods, body coverings, limbs, and reproduction for each group.
6. Jellyfish → jellyfish; Spider → arthropod; Snail → mollusc; Worm → earthworm.
7. Top Left: Antennae; Middle Left: Thorax; Bottom Left: Abdomen; Top Right: Head; Middle Right: Wing; Bottom Right: Leg.
Parent Tip: Review the logic above to help your child master the concept of classification of organisms worksheet.
