Why is sponge labelled as a soft material

Sponge is a soft tool or cleaning aid made of soft, porous material. Typically used for cleaning impervious surfaces. Sponges are especially good at absorbing water and water-based material.
It's soft because it's made of sponge.
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Ok.
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because it is soft
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Their bodies consist of skeletons made of a soft material called spongin, and a leathery skin broken by pores. The sponge eats by pumping seawater in through its pores. It filters microscopic plants from the water and expels the excess water through one or more large holes called oscula.
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Sponge is a soft material because it can be easily compressed and can be easily scratched so it is a soft material.
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