Read the passage carefully and answer the questions that follow.
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1》 Animals are great builders, using simple materials but employing sound engineering principles. So animals can't be called engineers.
2》Man has long used suspension bridges made of ropes of steel and concrete, which bear loads in tension.
3》Silk has a stiffness index which is 30 times less than of steel yet has a tensile strength one and a half time as much as that of a steel . unlike steel can stretch easily so it is elastic .
4》 Stress
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