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hodyreva [135]
1 year ago
12

As used in line 7, "challenged" most nearly means

Mathematics
1 answer:
Aneli [31]1 year ago
5 0

Correct answer is A. dared.

He described how they jumped up like popcorn, flapping their half-formed wings and taking 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 devised a project to look for clues in how baby game birds learned to fly.

This statement explains how he gets motivated to fly with half-formed wings and short hops. when graduate students presented him with a challenge for the age-old ground up tree down debate. This challenge was taken as a dare by him, and he devised a new project to teach baby birds to fly.

Hence the correct answer is A.

Below is the passage mentioned in the question is from Thor Hanson, Feathers by Thor Hanson -

" 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,

5 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

10 to see what clues might lie in how baby game birds

learned to fly."

.............................................................

Ken called the technique WAIR, for wing-assisted

incline running, and went on to document it in a

wide range of species. It not only allowed young

birds to climb vertical surfaces within the first few

weeks of life but also gave adults an energy-efficient

65 alternative to flying. In the Chukar experiments,

adults regularly used WAIR to ascend ramps steeper

than 90 degrees, essentially running up the wall and

onto the ceiling.

In an evolutionary context, WAIR takes on

70 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

75 half-formed wings (one of the main drawbacks to the

ground-up hypothesis). "

To learn more about passages from given link

brainly.com/question/12555695

#SPJ4

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