Although the crab tore off one of the starfish's arms, the boy tossed it back into the sea., When the beachgoers saw the load of rubbish left on the beach by the picnickers, they picked up 3 for the sea and put the rubbish into the bin., Because the ship had been torpedoed by the Russian submarine, it had sunk down onto the seabed, nearly one kilometre below the surface., If a sea urchin fears that it is under attack, it will release purple dye to confuse its predator.,

Challenge 2 - Sadie's differentiated version

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