Need to compare octopus camouflage with each option. From passage: "They belong to the Mollusca class Cephalopoda. But they don't look like their cousins at all. Other molluscs include sea snails, sea slugs, bivalves – most are shelled invertebrates with a dorsal foot." From passage: "It makes sense for these molluscs to have added protection in the form of a higher cognition; they don't have a shell covering them" Octopuses use advanced camouflage -> chromatophores, iridophores, papillae, leucophores -> because they have no shell for protection. Other molluscs like sea snails -> have shells for protection -> don't need fancy camouflage tricks.

Elimination Process: 🟢 Option 1: Sea snails -> most dissimilar -> Sea snails are molluscs but not cephalopods. They have shells for protection, so they don't need the fancy camouflage tricks that octopuses use. 🔴 Option 2: Cuttlefish -> very similar -> Passage says "cuttlefish and octopuses possess leucophores" - they're both cephalopods with same camouflage methods. 🔴 Option 3: Polar bears -> only mentioned as example -> Just used to explain how leucophores look white, not about actual camouflage techniques. 🔴 Option 4: Squids -> very similar -> Passage mentions squids can "imitate coral reef by growing miniature towers" using papillae - same camouflage methods as octopuses. Key insight: Cuttlefish and squids are fellow cephalopods -> share same camouflage toolkit. Sea snails rely on shells instead of color-changing tricks -> most different approach.

CAT (VARC) PYQs

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