0
Add your answer:
Earn +20 pts
What invertebrate group was the first to show cephalization?
The first invertebrate group to exhibit cephalization was likely the flatworms (phylum Platyhelminthes). Cephalization is the evolutionary process of concentration of sensory structures (such as eyes and other sense organs) and nervous tissues at the anterior end of an organism, forming a head region.
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).
Which phyla do not have cephalization?
Porifera (sponges), Ctenophora (comb jellies), and Placozoa do not exhibit cephalization, which is the development of a head region with sensory organs. These organisms typically lack centralized nervous systems and instead have dispersed nerve cells throughout their bodies.
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
What does annelids show by having bilateral symmetry with an anterior head where most sense organs are found?
Cephalization
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.
What two animal phyla show radial symmetry?
The two animal phyla that show radial symmetry are Cnidaria (such as jellyfish and sea anemones) and Echinodermata (such as starfish and sea urchins). Radial symmetry means that the body parts are arranged symmetrically around a central axis, like spokes on a wheel.
Within which taxonomic group do members show at least varition and withim which group do they show the most?
Members within a species show the least variation, while members within a kingdom show the most variation.
