Interactive mollusk classification activity for students, highlighting characteristics and types of mollusks.

Let's solve this molluscs classification task step by step.

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🔍 Step 1: Understand the Mollusc Classes

Molluscs are divided into three main groups:

1. Cephalopods – Have well-developed heads, tentacles, and often no shell (or reduced shell).
Examples: octopus, squid

2. Bivalves – Have a shell made of two hinged parts (valves).
Examples: mussel, cockle

3. Gastropods – Usually have a single spiral shell and a muscular foot. Some (like slugs) may lack a shell.
Examples: snail, slug

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🔍 Step 2: Analyze the Clues

We are given three descriptive clues:

1. "They have a shell divided into two halves."
→ This describes bivalves (e.g., mussels, cockles)

2. "They have tentacles."
→ This is characteristic of cephalopods (octopus, squid)

3. "They have two eyes on their antennae."
→ This refers to gastropods, like snails and slugs, which have eye stalks (antennae) with eyes at the tips.

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🔍 Step 3: Match Animals to Their Class

Now let’s classify each animal:

| Animal | Type | Reason |
|------------|-------------|-------|
| Snail | Gastropod | Has a single spiral shell; has eye stalks |
| Octopus | Cephalopod | Has tentacles; no shell |
| Squid | Cephalopod | Has tentacles; streamlined body |
| Mussel | Bivalve | Shell in two halves |
| Cockle | Bivalve | Shell in two halves |
| Slug | Gastropod | No shell, but related to snails; has eye stalks |

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✔ Final Classification Table

Now fill in the table:

| CEPHALOPODS | BIVALVES | GASTROPODS |
|------------------|--------------|----------------|
| octopus | mussel | snail |
| squid | cockle | slug |
| | | |

> Note: There are only two cephalopods (octopus, squid), two bivalves (mussel, cockle), and two gastropods (snail, slug).

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🧠 Bonus: Matching Clues to Groups

- "They have a shell divided into two halves." → Bivalves (mussel, cockle)
- "They have tentacles." → Cephalopods (octopus, squid)
- "They have two eyes on their antennae." → Gastropods (snail, slug)

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✔ Final Answer:

| CEPHALOPODS | BIVALVES | GASTROPODS |
|------------------|--------------|----------------|
| octopus | mussel | snail |
| squid | cockle | slug |

> ✔️ All animals are correctly classified based on their features.

Let me know if you'd like a printable version or explanation for younger learners!