Vertebrates and Invertebrates online pdf activity for 4 | Live ... - Free Printable

Let's solve this worksheet step by step.

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Part 1: Choose the correct word from the box

The word box includes:
- amphibians
- birds
- exoskeleton
- fish
- invertebrates
- mammals
- reptiles
- vertebrates

Now, let’s match each description:

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1. Animals with a backbone
→ vertebrates
*Explanation:* Vertebrates are animals that have a backbone or spinal column.

2. Animals without a backbone
→ invertebrates
*Explanation:* Invertebrates lack a backbone.

3. A hard outer covering on many invertebrates
→ exoskeleton
*Explanation:* Many invertebrates like insects and spiders have an exoskeleton (a hard outer shell).

4. Vertebrates covered in feathers
→ birds
*Explanation:* Birds are the only vertebrates that have feathers.

5. Vertebrates with soft, moist skin
→ amphibians
*Explanation:* Amphibians (like frogs and salamanders) have soft, moist skin that helps them breathe.

6. The vertebrate group that humans belong to
→ mammals
*Explanation:* Humans are mammals — warm-blooded, have hair, and produce milk for their young.

7. Vertebrates that live only in water
→ fish
*Explanation:* Fish are aquatic vertebrates that live in water and breathe through gills.

8. Vertebrates with dry scaly skin
→ reptiles
*Explanation:* Reptiles (like snakes, lizards, and turtles) have dry, scaly skin.

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Part 2: Identify whether each animal is a vertebrate or invertebrate

Look at the images:

9. Fly
→ invertebrate
*Explanation:* Flies are insects; they have no backbone and have an exoskeleton.

10. Human (man)
→ vertebrate
*Explanation:* Humans are mammals and have a backbone.

11. Shark
→ vertebrate
*Explanation:* Sharks are fish and have a backbone (even though it's made of cartilage, not bone).

12. Spider
→ invertebrate
*Explanation:* Spiders are arachnids; they have no backbone.

13. Snail
→ invertebrate
*Explanation:* Snails are mollusks and lack a backbone.

14. Penguin
→ vertebrate
*Explanation:* Penguins are birds — they have a backbone and feathers.

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✔ Final Answers:

#### Part 1:
1. vertebrates
2. invertebrates
3. exoskeleton
4. birds
5. amphibians
6. mammals
7. fish
8. reptiles

#### Part 2:
9. invertebrate
10. vertebrate
11. vertebrate
12. invertebrate
13. invertebrate
14. vertebrate

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This worksheet teaches classification of animals based on physical characteristics, especially the presence or absence of a backbone. Understanding these traits helps organize the animal kingdom into major groups.