Sponges are one of the simplest multicellular animals and are traditionally considered the oldest surviving animal clade. Similarities between choanocytes (the defined cell type of sponge) and choanoflagellates (single cells and colonial protists) have long suggested an evolutionary link between them. 20 min. 2018 г.
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.
Why is the sponge the simplest of all multicellular animals?
Some sponges can create elaborate skeletons, but they are not considered integrated multicellular animals due to the lack of nervous system and muscle fibers. .. The sponge is one of the simplest animals, the tissue is partially differentiated, but without muscles, nerves or internal organs.
Is the sponge a single animal?
One of the sponges and the primitive multicellular aquatic animals that make up the sponge phylum. Approximately 5,000 species are listed and inhabit all oceans that attach to surfaces above 8,500 meters (29,000 feet) deep from the intertidal zone.
Are animals of the phylum Sponge unicellular or multicellular?
& gt;Also known as a sponge. These are by far the simplest multicellular animals. It is multicellular, but has no tissues or organs. Sponges live in aquatic habitats because they need to be in close contact with water.
Below you will find two helpful answers on a similar topic. 👇
Do sponges have a specialized respiratory system?Do sponges have specialized organs?
