Question Detail
Question
Which phylum includes earthworms and leeches, characterized by a true coelom and a closed circulatory system?
Correct Answer
Option C is the correct answer.
Detailed Explanation
Under 'Phylum Annelida (Segmented Worms)', key features include 'Body cavity: True coelom (schizocoelom)' and 'Circulatory system: Closed circulatory system.' Earthworms and leeches are listed as examples.
Hint
Think about segmented worms and their advanced internal systems.