Classify invertebrates as arthropods or molluscs based on characteristics like shells, segmented bodies, and exoskeletons.

Let's solve this classification task by identifying which animals are arthropods and which are molluscs, based on their characteristics.

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🔍 Key Characteristics to Remember:

#### ✔ Arthropods:
- Have a segmented body
- Have jointed limbs
- Have an exoskeleton
- Many have antennae
- Often have compound eyes

Examples: insects, spiders, crabs, lobsters, butterflies

#### ✔ Molluscs:
- Usually have a soft body
- Many have a shell (but not all)
- Often have tentacles
- No jointed limbs
- No exoskeleton (they may have a shell or mantle, but not a hard external skeleton like arthropods)

Examples: snails, clams, squids, octopuses

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🐌 Now, let’s classify each animal:

1. Snail
- Soft body, has a shell, has tentacles
→ MOLLUSC

2. Squid
- Soft body, no shell (some squid have internal structures), has tentacles
→ MOLLUSC

3. Butterfly
- Segmented body, jointed legs, antennae, exoskeleton
→ ARTHROPOD

4. Spider
- Segmented body, jointed legs, exoskeleton, no antennae (but still an arthropod)
→ ARTHROPOD

5. Mussel
- Soft body, has a shell, no limbs with joints
→ MOLLUSC

6. Beetle
- Hard exoskeleton, segmented body, jointed legs, antennae
→ ARTHROPOD

7. Lobster
- Segmented body, jointed limbs, exoskeleton
→ ARTHROPOD

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✔ Final Classification:

#### 🐞 ARTHROPODS:
- Butterfly
- Spider
- Beetle
- Lobster

#### 🐌 MOLLUSCS:
- Snail
- Squid
- Mussel

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✔ Answer:

ARTHROPODS box should include:
- butterfly
- spider
- beetle
- lobster

MOLLUSCS box should include:
- snail
- squid
- mussel

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💡 Summary:

Even though some molluscs (like snails) have shells, they lack jointed limbs and exoskeletons. Arthropods have jointed appendages and an exoskeleton, even if they don’t have a shell.

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