Hey A Biology Question Need Help

Question

1.what kind of nervous system do earthworms have? None,Rudimentary,or Developed

2. How do earthworms move (Locomotion)

Answer 1

1. Rudimentary (Simple): A earthworm has a nervous system with a simple brain and nerve cord.

2. Earthworms move via a sliding motion accomplished with bristles on each segment called setae which help the earthworm move. Earthworms have no limbs. The earthworm has two sets of muscles; one that makes it long and thin and one that makes it fat.  

Answer 2

1. Rudimentary. It is simple yet existent.

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The earthworm has a simple yet sensitive nervous system. Its cerebral ganglion, or brain, is connected to the ventral nerve cord, which runs the length of its body. At each segment, segmental ganglion branch off from the ventral nerve cord, thus connecting every segment to the earthworm's brain. Each segmental ganglion must be well coordinated with each other since they must interact in order to control muscle contractions in each segment that are responsible for locomotion. Thanks to this responsive nervous system, an earthworm is sensitive to touch, light from in front or in back, moisture, chemicals, temperature, and vibrations

http://www.angelfire.com/de2/atoy/ner.ht...

2. Earthworms move along by extending the front end of the body, taking hold of the substrate using the front bristles, then retracting the bristles at the rear of the body and drawing up the rear end.

http://www.austmus.gov.au/factSheets/ear...

Answer 3

1 none

2 sliding motion