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If given no choice, all snails will eat plants. So will you. Apple snails even eat sponge filters. Trapdoor snails are not quite as voracious. But put a dozen in a 10-gallon tank with no food and theyâll eat filters, too. They much prefer fish food. In the absence of fish food, they will eat algae AND plants.
Oyster drills bore into other mollusk shells, kill and eat body Cone shells are predators with harpoon-like radula Some sea slugs (nudibranchs) eat cnidarian polyps and incorporate stinging cells Terrestrial forms evolved a rudimentary lung under mantle Air has much more oxygen than water - a lung is more efficient than a gill in air