The harder silica or calcium spicules are absent and the softer spongin remains.
Answer:
They are soft because they should not hurt the body parts while having a bath. the skin is too soft to use a bath sponge, if the sponge is too hard.
Chat with our AI personalities
Sponges displace the ocean's water, and the water that they do "suck up" becomes part of their volume, and thus has no effect on the depth of the oceans. When you remove sponges, they will no longer displace water in the ocean, so the ocean will actually be shallower.
A tube sponge gets their good from a fliter in there mouth. ( The fliter is there mouth)
Sea Sponges, They Absorb The Most Water Or Any Fluid And Synthetic Sponges Don't Have As Much Absorbency, Also They Don't Have As Many Holes.
It's purpose is to allow users who want to relax and take bath to gently lie back and place their heads on something soft instead of the tub itself. Using this is relaxing and puts less strain on your neck.
it is not hard,only when put in oven,so it is soft