Module 4 Chapter 31 Multiple choice questions 31.6

. What type of movement is used by the polychaete Nereis worm?

. Refer to the figure.

The body of the earthworm is represented by a horizontal line. The line has segments 1 to 12 from the right to the left. Segments 4 and 5 are marked as contracting.

This figure represents an earthworm moving in the direction shown. The earthworm moves by alternating circular contractions and longitudinal extensions of its body. If segments 4 and 5 are currently undergoing contractions, which segment(s) would you expect to contract next to move the earthworm forward?

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