Answer :
Correct option is D. Lines 72-74 ("something . . . theory")
In lines 73-75, the author provides evidence that “the flapping flight stroke” is “something gliding animals don’t do.
Choices A, B, and C do not provide the best evidence that gliding animals do not use a flapping stroke to aid in climbing slopes. These choices do not contain information about gliding animals.
Previous Question is -
What can reasonably be inferred about gliding animals from the passage?
This question is based on lines from paragraph by Thor Hanson, Feathers. ©2011 by Thor Hanson which is given below -
"At field sites around the world, Ken Dial saw a pattern in how young pheasants, quail, tinamous, and other ground birds ran along behind their parents. “They jumped up like popcorn,” he said, describing how they would flap their half-formed wings and take short hops into the air. So when a group of graduate students challenged him to come up with new data on the age‑old ground-up-tree-down debate, he designed a project to see what clues might lie in how baby game birds learned to fly.
Ken settled on the Chukar Partridge as a model species, but he might not have made his discovery without a key piece of advice from the local rancher in Montana who was supplying him with birds. When the cowboy stopped by to see how things were going, Ken showed him his nice, tidy laboratory setup and explained how the birds’ first hops and flights would be measured. The rancher was incredulous.
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W A I R takes on surprising explanatory powers. With one fell swoop, the Dials came up with a viable origin for the flapping flight stroke of birds (something gliding animals don’t do and thus a shortcoming of the tree-down theory) and an aerodynamic function for half-formed wings (one of the main drawbacks to the ground-up hypothesis)."
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