Post category:Exam Tips / Fill in the Blanks (Reading)
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Here are Top 3 frequently asked Fill in the Blanks (Reading) questions in recent PTE Academic test (October 2020).

1.Colorful Poison Frogs

Colorful poison frogs in the Amazon owe their great diversity to ancestors that leapt into the region from the Andes Mountains several times during the last 10 million years, a new study from The University of Texas at Austin suggests.

This is the first study to show that the Andes have been a major source of diversity for the Amazon basin, one of the largest reservoirs of biological diversity on Earth. The finding runs counter to the idea that Amazonian diversity is the result of evolution only within the tropical forest itself.

“Basically, the Amazon basin is a ‘melting pot’ for South American frogs,” says graduate student Juan Santos, lead author of the study. “Poison frogs there have come from multiple places of origin, notably the Andes Mountains, over many millions of years. We have shown that you cannot understand Amazonian biodiversity by looking only in the basin. Adjacent regions have played a major role.”

2.Alchemy

To learn the speech of alchemy, an early form of chemistry in which people attempted to turn metals into gold, it helps to think back to a time when there was no science: no atomic number or weight, no periodic chart no list of elements, to the alchemists the universe was not made of leptons, bosons, gluons, and quarks. Instead, it was made of substances, and one substance – say, walnut oil – could be just as pure as another – say, silver – even though modern scientists would say one is heterogeneous and the other homogeneous. Without knowledge of atomic structures – how would it be possible to tell elements from compounds?

3.Work of Scientists

Scientists make observations, assumptions and do experiments. After these have been done, he analyses the results. These results are compiled into data which gives scientists a clearer picture of world around us.