Biologists have predicted that birds feather structures vary with habitat temperature, but this hadn't been tested in mountain environments. Omithologist Sahas Barve studied feathers from 249 songbird species inhabiting different elevations-and thus experiencing different temperatures-in the Himalaya Mountains. He found that feathers of high- elevation species not only have a greater proportion of warming downy sections to flat and smooth sections than do feathers of low-elevation species, but high clevation spocies' feathers also tend to be longer, providing a thicker layer of insulation. Which choice best states the main idea of the text? Choose 1 answer A Barve's investigation shows that some species of Himalayan songbirds have evolved feathers that better regulate body temperature than do the feathers of other species.contradicting previous predictions. B The results of Barve's study suggest that the ability of birds to withstand cold temperatures is determined more strongly by feather length than feather structure, challenging an established belief. C Barve found an association between habitat temperature and feather structure among Himalayan songbirds, lending new support to a general prediction. D Barve discovered that songbirds have adapted to their c Do 4 problems O 000

Question

Soru

Biologists have predicted that birds feather structures vary with habitat temperature, but this hadn't been tested in mountain environments. Omithologist Sahas Barve studied feathers from 249 songbird species inhabiting different elevations-and thus experiencing different temperatures-in the Himalaya Mountains. He found that feathers of high- elevation species not only have a greater proportion of warming downy sections to flat and smooth sections than do feathers of low-elevation species, but high clevation spocies' feathers also tend to be longer, providing a thicker layer of insulation. Which choice best states the main idea of the text? Choose 1 answer A Barve's investigation shows that some species of Himalayan songbirds have evolved feathers that better regulate body temperature than do the feathers of other species.contradicting previous predictions. B The results of Barve's study suggest that the ability of birds to withstand cold temperatures is determined more strongly by feather length than feather structure, challenging an established belief. C Barve found an association between habitat temperature and feather structure among Himalayan songbirds, lending new support to a general prediction. D Barve discovered that songbirds have adapted to their c Do 4 problems O 000

Answer 1

The correct answer is 'C'.

Answer 2

## Step 1 The first step in solving this problem is to understand the main idea of the text. The text discusses Sahas Barve's study on the feathers of different songbird species in the Himalaya Mountains. The study found that high-elevation species have feathers with a greater proportion of warming downy sections and longer feathers, providing better insulation. ## Step 2 Next, we need to match the main idea of the text with the given options. The text does not suggest that Barve's findings contradict previous predictions, nor does it imply that feather length is more important than feather structure. It also does not suggest that songbirds have adapted to their environment in a way that is not related to temperature. ## Step 3 Finally, we need to choose the option that best states the main idea of the text. The text suggests that there is an association between habitat temperature and feather structure among Himalayan songbirds, which supports a general prediction.

Soru

Çözüm

Cevap

Açıklamak