PrepTest 86, Section 3, Question 10
When a bird flies, powerful forces converge on its shoulder joints. The bird's wings must be kept stable during flight, which cannot happen unless something balances these forces. The only structure in birds capable of balancing them is a ligament that connects the wing to the shoulder joint. So that ligament must be _______.
When a bird flies, powerful forces converge on its shoulder joints. The bird's wings must be kept stable during flight, which cannot happen unless something balances these forces. The only structure in birds capable of balancing them is a ligament that connects the wing to the shoulder joint. So that ligament must be _______.
When a bird flies, powerful forces converge on its shoulder joints. The bird's wings must be kept stable during flight, which cannot happen unless something balances these forces. The only structure in birds capable of balancing them is a ligament that connects the wing to the shoulder joint. So that ligament must be _______.
When a bird flies, powerful forces converge on its shoulder joints. The bird's wings must be kept stable during flight, which cannot happen unless something balances these forces. The only structure in birds capable of balancing them is a ligament that connects the wing to the shoulder joint. So that ligament must be _______.
Which one of the following most logically completes the argument?
the only structure that is indispensable to bird flight
the reason that a bird's wings must be kept stable during flight
the sole connection between the wing and the shoulder joint
the source of the powerful forces that converge on the shoulder joint
the means by which a bird stabilizes its wings during flight
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