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11 Cards in this Set
- Front
- Back
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what characteristic is responsible for the branching off of the roundworms from earlier animals? |
pseudocoelomate; not lined with mesoderm |
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what level of organization do these organisms demonstrate? |
alimentary |
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how many tissue layers do these organisms have? |
organ system (triploblastic) |
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what type of digestive system do they have? |
alimentary canal (extra and intracellular) |
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type of excretory system? |
waste exits the excretory pores |
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type of circulatory system? |
none |
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type of respiratory system? |
none |
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type of nervous system? |
cerebral ganglia or nerve ring with anterior and posterior nerves |
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type of asexual reproduction? |
none |
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type of sexual reproduction? |
complicated life cycles |
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cross section of nematode |
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