What is a shared characteristic of flatworms and nematodes?

a. Poorly developed excretory systems
b. Complete digestive systems
c. Tough, inflexible exoskeletons
d. Complete respiratory systems


a. Poorly developed excretory systems

Flatworms and Nematodes have poorly developed excretory systems.

Biology & Microbiology

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A) contracts; relaxes B) relaxes; contracts C) relaxes; relaxes D) contracts; contracts

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__________________ Indicate whether the statement is true or false.

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The plant phase that produces gametes is called

A. Sporophyte B. Zygote C. Gametophyte D. Spore

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Cells can be large if they 

A. are metabolically very active. B. have metabolically inactive central regions. C. actively pump nutrients into the cell. D. have a very small surface area compared to their volume.

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