How do sponges eat? Detailed answer

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How do sponges eat? Detailed answer

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How do sponges eat?

It may be hard to believe, but sponges are animals! These are one of the strangest representatives of the animal kingdom and look more like plants than animals. There are over five thousand different types of sponges. They come in all sorts of colors, ranging from green, brown, yellow, red and orange to white. They can be shaped like a fan, dome, ball and bell. Some sponges branch like trees. Others are spread out in flat masses of spongy tissue over the surface of underwater rocks, large shells and pieces of wood. Some of them are quite small, less than two centimeters in length. Others, on the contrary, are large: up to a meter in height or in width.

Adult sponges never move from place to place. And despite the fact that the sponge is an animal, it will not react in any way to your touch. The sponge has no head or mouth. She has no eyes, no ears, no other senses. Sponges also lack a heart, stomach, muscles, and nervous system. If a living sponge is cut in half, all you see is a slimy mass with holes or channels running through it. Doesn't that make her look like an animal at all? And you can well understand why even scientists could not recognize an animal in her for a very long time.

So what makes a sponge an animal? The way she eats. The sponge catches its food. It does not, like green plants, produce food for itself, but feeds on small plants and animals that live in the water next to it. How does she do it? Spongy walls resemble a sieve, or filter, which strains small plants and animals from the water. Water is driven in and out of the sponge by constantly moving small, whip-like filaments called flagella. Flagellated cells capture food. Around the base of the flagellum is a sticky surface, to which food sticks. Some part of the food is digested there, and the remaining food is carried by cells "traveling" along the sponge to other areas.

Author: Likum A.

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