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(C) The phylum Aschelminthes is commonly known as roundworms.$(I)$ Their body is circular in cross-section,hence the name roundworms. This statement i

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$I, II$ and $III$

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(C) The phylum Aschelminthes is commonly known as roundworms.$(I)$ Their body is circular in cross-section,hence the name roundworms. This statement is correct.$(II)$ They may be free-living,aquatic,terrestrial,or parasitic in plants and animals. This statement is correct.$(III)$ They exhibit an organ-system level of body organization. This statement is correct.$(IV)$ They possess a complete digestive system with a well-developed muscular pharynx. Therefore,this statement is incorrect.Thus,statements $(I), (II),$ and $(III)$ are correct.

Choose the correct option for characters of roundworm.
$(I)$ Body is circular in cross-section.
$(II)$ Parasite found in animals and plants.
$(III)$ Organ-system level of body organization.
$(IV)$ Incomplete digestive system.

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Choose the correct option for characters of roundworm.$(I)$ Body is circular in cross-section.$(II)$ Parasite found in animals and plants.$(III)$ Organ-system level of body organization.$(IV)$ Incomplete digestive system.