How could a biologist distinguish an acoel flatworm from a free living platyhelminth?
A. The acoel worm would be solid throughout, since it lacks a gut.
B. The acoel worm would have a nervous system.
C. The platyhelminth would have a more primitive gut and nervous system.
D. Only the acoel is triploblastic.
Clarify Question
· What is the key concept addressed by the question?
· What type of thinking is required?
Gather Content
· What do you already know about acoel flatworms?
Choose Answer
· Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer?
Reflect on Process
· Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
A. The acoel worm would be solid throughout, since it lacks a gut.
Clarify Question
· What is the key concept addressed by the question?
o This question addresses acoel flatworms.
· What type of thinking is required?
o This question is asking you to take what you already know and apply it to this unfamiliar situation.
Gather Content
· What do you already know about acoel flatworms?
o Acoel flatworms are the simplest bilaterians. They are called “acoel” because they lack a coelom.
o They are the sister group to all the other Bilateria – the protostomes and the deuterostomes.
Choose Answer
· Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer?
o Acoel flatworms lack a gut. They also have a primitive nervous system.
o Platyhelminthes, in contrast, have a proper gut and a more advanced nervous system. They are superficially similar to acoel flatworms, but different on the inside.
Reflect on Process
· Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
o The question required you to take what you already know and apply it to this unfamiliar situation.
o Did you recognize that acoel flatworms lack a gut, and have a more primitive nervous system than the playhelminthes?
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