Fun worksheet activity where students identify and sort various marine animals like whales, sharks, and jellyfish into their correct biological classifications.

Explanation:
We need to sort the marine animals shown into the correct biological groups on the right:
- Invertebrate
- Vertebrate (Mammal)
- Fish
- Bird
- Reptile

Let’s go through each animal one by one and classify it:

1. Starfish – Has no backbone → Invertebrate
2. Shark – Has a backbone, lives in water, has gills, fins → Fish
3. Whale – Has a backbone, breathes air with lungs, gives live birth, feeds young milk → Vertebrate (Mammal)
4. Seal – Same as whale: air-breathing, live birth, milk → Vertebrate (Mammal)
5. Octopus – Soft body, no backbone → Invertebrate
6. Squid – Also soft-bodied, no backbone → Invertebrate
7. Dolphin – Like whales and seals: mammal → Vertebrate (Mammal)
8. Penguin – Has feathers, lays eggs, warm-blooded, flies? No — but still a bird (flightless bird) → Bird
9. Turtle (sea turtle) – Has scales, lays eggs on land, cold-blooded, breathes air → Reptile
10. Jellyfish – Gelatinous, no backbone → Invertebrate
11. Seahorse – Has backbone, gills, fins, lives in water → Fish
12. Manatee – Large aquatic mammal, gives live birth, nurses young → Vertebrate (Mammal)
13. Crab – Hard shell, jointed legs, no backbone → Invertebrate
14. Lobster – Same as crab → Invertebrate
15. Sea lion – Marine mammal → Vertebrate (Mammal)

Now group them clearly:

- Invertebrate: Starfish, Octopus, Squid, Jellyfish, Crab, Lobster
- Vertebrate (Mammal): Whale, Seal, Dolphin, Manatee, Sea lion
- Fish: Shark, Seahorse
- Bird: Penguin
- Reptile: Turtle

Double-check:
- All mammals listed are warm-blooded, breathe air, nurse young — correct.
- Fish have gills and fins — shark and seahorse qualify.
- Penguin is a bird (even though flightless).
- Sea turtle is a reptile (lays eggs on land, scaly skin).
- Invertebrates lack backbones — all others fit.

Final Answer:
Invertebrate: starfish, octopus, squid, jellyfish, crab, lobster
Vertebrate (Mammal): whale, seal, dolphin, manatee, sea lion
Fish: shark, seahorse
Bird: penguin
Reptile: turtle