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Fill in the blanks reading practice

Colorful poison frogs in the Amazon owe their great ____1_____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  _____2_____source of diversity for the Amazon basin, one of the largest reservoirs of  ____3____diversity on Earth. The finding runs ___4___ to the idea that Amazonian diversity is the result of evolution only within the tropical forest itself.


Biological             counter            major               diversity            opposing          small





  1. diversity

2. major

3. biological

4. Counter

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