A shell is considered as biotic (living) because it is a hard, rigid covering of many animals such as snail, sepia, pila, turtles, sea urchins. A shell is protective outer layer of these soft bodied animals.
That's 11 to 20 lbs. (about 5 to
9 kg)
If your asking how kitchen tools avoid rusting the answer is to maintain them dry after use or buying stainless steel that contains chromium which helps the metal protect it from rusting
The earth will have lack of oxygen and the earth's temperature will increase in heat rapidly.
