What are sponges?

What are sponges?

Sponges are in fact the simplest of animals, having no head, moth, limbs, heart or lungs. Strange, but true! They are just hollow blobs of jelly, made of minute cells, and coloured red, green, brown or orange. Tiny horny needles stiffen the sponge’s body and give it shape.

Water containing oxygen and minute particles of food enter the sponge’s body through the tiny holes on its side. Digestive cells absorb the food and oxygen and let out the waste. The used water is spurted out by these cells through a single outlet like a volcano. Baby sponges hatch from eggs inside the parent, which spurt out the young ones in the same volcanic fashion. Scientists have carried out experiments on these strange organisms and came out with strange findings. They separated the cells of the sponge by sieving them. But when left in a dish of water, they come together again to build a new sponge or numerous sponges.

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