Q.

Which of the following happened after ‘Isthmus of Panama’ linked North America and South America about 10 mya?

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a

The South American fauna that migrated northwards dominated the North American fauna.

b

More species became extinct in North America than in South America.

c

There was an equal increase in the number of faunal species in both the continents.

d

The North American fauna that migrated southwards dominated the South American fauna.

answer is B.

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Detailed Solution

Isthmus of Panama is the narrow strip of land that links North and South America. It is formed due to tectonic activity about 10 mya. When South America joined North America, the South American fauna were overridden by the North American fauna.

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