The external gills of an adult axolotl are not as efficient as fish gills because___________.
A. axolotl gills are covered by thick layers of cells
B. axolotl gills are not highly branched
C. blood flows though the axolotl gills more slowly than through fish gills
D. axolotls are slow swimmers and all fish swim fast to ventilate their gills
E. water flows over the axolotl gills at many different angles
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 axolotl gills? What other information is related to the question?
Choose Answer
Given what you now know, what information 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?
E. water flows over the axolotl gills at many different angles
Clarify Question
What is the key concept addressed by the question?
· This question is asking you to compare the gills of an axolotl to the gills of a fish.
What type of thinking is required?
· Apply level:
o You are being asked to take what you already know and apply it to the efficiency of axolotl gills.
Gather Content
What do you already know about axolotl gills? What other information is related to the question?
· Axolotl gills are located around the neck of the animal.
· These gillsmust be moved constantly to ensure that gas exchange will occur.
· Axolotl gills are highly branched, and this external branching creates drag on the animal and slows its locomotion.
· The branching of gills creates multiple directions of water flow over the gills.
Choose Answer
Given what you now know, what information is most likely to produce the correct answer?
· While axolotls do move relatively slowly, some fish swim slowly as well.
· Axolotl gills are highly branched, but they are not covered with a thick layer of cells.
· Blood flow through axolotl gills is not slower than blood flow through fish gills.
· Axolotl gill efficiency is lowered by the lack of consistent flow of water over the gill structures.
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?
· Apply level:
o Answering this question correctly depended on your ability to use axolotl gill structure in a new situation. If you got an incorrect answer, did you remember that axolotl gills are external, or that axolotls must move water over their gills for gas exchange to occur? Did you have trouble extending the anatomy of axolotl gills to determine the correct answer?
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