Sponges do not have organs or true tissues, but they do have special cells that can perform different functions in vivo. Cell specialization is one of the main advantages that multicellular or metazoans are superior to unicellular organisms. 11th. 2015 г.
Are sponges considered multicellular?
Sponges are one of the simplest multicellular animals and are traditionally considered the oldest surviving animal clade. Similarities between choanocytes (defining the cell type of sponges) and choanoflagellates (single cells and colonial protists) have long suggested an evolutionary link between them. 2018
Why are sponges not considered complex creatures?
The cells that make up an organism are embedded in a single gelatinous mass called a sponge. Sponges, no matter how big, small, young or long-lived, lack special tissues, organs and muscles.
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.
What is a multicellular organism?
Unicellular organisms are made up of only one cell that performs all the functions that the organism needs, while multicellular organisms use many different cells to function. .. Unicellular organisms include bacteria, protists, and yeast.
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