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Q. What is the major evolutionary novelty presented by annelids?
The main evolutionary novelty presented by the beings of the phylum Annelida is the coelom, the internal body cavity totally covered by mesoderm, a feature also present in arthropods, molluscs, chordates and echinoderms. acoelomate are Platyhelminthes and nematodes are pseudocoelomate (their internal cavity is partially covered by mesoderm).
Another significant evolutionary novelty of the annelids is the closed circulatory system.
Why does having three color receptors (a.k.a. opsins) lead to a more complex color perception than just two?
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Nursing Assessment If the cause is due to hypovolemia you may observe the child for dry mucus membrane, poor skin turger, hypotension and oliguria. You should also observe
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family ,genus, class order , species of mollusca
what is vaso-constriction
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