Asked by Arpit Bapna on Jun 09, 2024
Verified
The simplest cephalization occurs in ____.
A) sea anemones
B) planarian flatworms
C) octopuses
D) vertebrates
E) grasshoppers
Cephalization
Evolutionary trend whereby neurons that detect stimuli and process information become concentrated in the head of a bilateral animal.
Planarian Flatworms
A group of free-living flatworms known for their remarkable regenerative abilities, commonly used in research on regeneration and stem cells.
- Determine the morphological and functional attributes of distinct cerebral areas and their involvement in thinking, feeling, and movement control.
Verified Answer
NL
Nikki LightJun 12, 2024
Final Answer :
B
Explanation :
Planarian flatworms have the simplest form of cephalization, with a rudimentary brain and nerve cords running along the length of their body. They have a concentration of sensory organs at the head end of their body, indicating a basic form of sensory processing and coordination. Sea anemones, although also having a concentration of sensory organs, do not have a central nervous system or brain. Octopuses have a highly developed nervous system and complex cephalization, while vertebrates have a well-developed brain and vertebral column. Grasshoppers have a rudimentary nervous system and some cephalization, but not as developed as that of planarian flatworms.
Learning Objectives
- Determine the morphological and functional attributes of distinct cerebral areas and their involvement in thinking, feeling, and movement control.