0 any animal that has a soft body, no spine, and is often covered with a shell. Many mollusks live in water: --
Oysters are mollusks, as are snails and cuttlefish.
1 any of a large group of animals that have soft bodies, no spine (= supporting bones), and usually a hard shell: --
We can complete it step by step however long the road is and it can't be completed however short the road is if you don't even mark your footprint.
Можем да го завършим стъпка по стъпка, колкото и дълъг да е пътят и не може да бъде завършен, колкото и кратък да е пътят, ако дори не маркирате отпечатъка си.