write two Peculiar features of sponges
Answers
Answer:
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Explanation:
Sponges differ from other animal phyla by their unique possession of 5 distinct features.
Choanocytes
Water canal (aquiferous) system
Organic and inorganic skeletons
Totipotency
Plasticity
Queensland Museum
Answer:
All sponges are aquatic, most are marine, found from the deepest oceans to sub-terrestrial environments (where they can survive remarkably well).
They are the most primitive of the multicellular animals. Their bodies lack true tissues but are composed of many different cell types each with special functions.
The sponge ‘skin’ is composed of special cells that surround the upper and lower surfaces of the body (exopinacocytes and basipinacocytes respectively), with a middle layer (or mesohyl) in which all the other cells occur.
Within this middle layer the body plan may vary from simple to complex, depending on the complexity of infolding of the body wall and water canals throughout the sponge. Most sponge body plans are complex and adults are asymmetrical (or some radially symmetrical).
Also within this middle layer, sponge cells roam throughout the body; transporting food, oxygen, waste products, building organic skeletons, secreting inorganic skeletons, or forming feeding chambers. This mobility of cells, together with their ability for cells to change function from a stem cell (archaeocyte) to any other cell type, and back again as needs be (totipotency), gives them a great evolutionary advantage. It means they can change growth forms depending on local environmental conditions. They are the ultimate plastic beings.
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