How many of the following can be used to distinguish a nematode worm from an annelid worm?
1. type of body cavity
2. number of muscle layers in the body wall
3. presence of segmentation
4. number of embryonic tissue layers
5. shape of worm in cross-sectional view
A) one of these
B) two of these
C) three of these
D) four of these
E) five of these
Answer: C
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