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platehelminthes (flat worms)

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16y ago

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Which invertebrate phyla was first to show cephalization?

Platyhelminthes


Do nematodes show cephalization?

Phylum Nematoda does exhibit cephalization. Cephalization is a evolutionary trend in development in which the sensory and neural organs of a species becomes concentrated on one end of an organism.


In what two ways do planarian show cephalization?

Yes, they have (primitive) sense organs anteriorally placed - this represents cephalisation, as does the aggregation of nervous tissue to monitor and respond to impulses from the anterior sense cells/organs.


Annelids show what by having bilateral symmetry?

cephalization for segmented worms, but idk about anything else


Which phyla do not have cephalization?

Subregnum: ParazoaPhylum: PoriferaSubregnum: AgnotozoaSuperphylum: RadiataPhylum: BrachiopodaPhylum: BryozoaPhylum: DicyemidaPhylum: EntoproctaPhylum: Gastrotricha


What does annelids show by having bilateral symmetry with an anterior head where most sense organs are found?

Cephalization


List the phyla that show cephalization?

The phyla that show cephalization include Chordata (which includes vertebrates), Arthropoda (including insects, crustaceans, and spiders), Annelida (segmented worms), and Mollusca (which includes snails, clams, and octopuses).


Do bivalves show cephalization of a clam?

No - class Bivalvia of phylum mollusca have no head examples are clams, oysters, and mussels


What cephalization does a platyhelminthes have?

Platyhelminthes show the simplest form of cephalization among animals. They have a concentration of sensory organs and nerve cells at the anterior end of their body, which forms a head-like structure. This allows them to detect and respond to stimuli efficiently.


Is trematoda or nematoda evolutionarily more advanced?

Trematoda are more evolutionarily advanced because they show the traits of cephalization, an organ system, and have a lophophore. While nematoda have none of these traits.


When did the Adelaide show start?

Their have been many incarnations of the show, but the first show run by the same group that run today's dates back to December of 1840.


What group was the opening act for the first show of Spinal Taps reunion tour in 2001?

The Folksmen!!