Sponge is essentially a multicellular organism with no organs or tissues, but with specialized cells, distinguishing it from small multicellular protists. a typical barrel or tube sponge is essentially a perforated sac. 17th. 2011 г.
Is the sponge multicellular or unicellular?
Sponges are one of the simplest multicellular animals and are traditionally considered the oldest surviving animal clade. The similarity between choanocytes (the defined cell type of sponge) and choanoflagellates (single cells and colonial protists) has long suggested an evolutionary link between them.
Are sponges multicellular and eukaryotic?
This phylum is thought to represent the transition from unicellular to multicellular animals. Most (but not all) sponges are asymmetric and do not have a well-defined shape. Like all animals, sponges are eukaryotes. That is, the cell has a nucleus.
Do sponges have cells?
Special cells for sponges include cells that filter seawater. Phagocytic cells (cells that swallow and digest food particles); those that form the external "skin", breathing holes, and tubes through which water enters and exits the body. And it secretes minerals and organic skeletons called spicules.
Is the sponge the first multicellular organism?
About 600 million years ago, the first multicellular organism, a simple sponge, appeared on Earth. Five and 53 million years ago, the Cambrian explosion occurred when the ancestors of modern life began to evolve rapidly.
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