Final answer:
Flukes, tapeworms, and nematodes are all considered helminths, with flukes and tapeworms being part of the Platyhelminthes phylum, and nematodes belonging to Nematoda. Therefore, the correct answer to the student's question is A) All of these are correct. Flukes are a type of trematode within the Platyhelminthes, and tapeworms are referred to as cestodes.
Step-by-step explanation:
All of the following are considered to be helminths: flukes, tapeworms, and nematodes. Flukes, which are a type of trematode, belong to the Platyhelminthes phylum along with tapeworms, making both flukes and tapeworms types of flatworms. Nematodes, commonly known as roundworms, are categorized in a separate phylum called Nematoda. These helminths are common intestinal parasites, which include species such as roundworms, pinworms, hookworms, whipworms, beef tapeworms, pork tapeworms, and fish tapeworms. Each type of worm has specific characteristics and modes of transmission, often related to undercooked food or poor hygiene.
Therefore, to answer multiple aspects of your question: the correct answer to 'All of the following are considered to be helminths' is A) All of these are correct. A fluke is classified within the phylum Platyhelminthes, C) Platyhelminthes. A nonsegmented worm found during colonoscopy that causes symptoms like abdominal cramps is likely a B) fluke, which is also a type of trematode.
Lastly, the type of worm that has male and female reproductive organs in each segment and uses hooks to attach to the intestinal wall is the C) cestode. This is another name for tapeworms, which are segmented flatworms belonging to the phylum Platyhelminthes.