miranAv1ile miranAv1ile

12-06-2016
Geography

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The minimum number of American bird species known to have precise migration instincts is:

A: 10+
B: 100+
C:1000+
D:10,000+

Respuesta :

taskmasters taskmasters

12-06-2016

option b. 100+

Some birds are nomadic in winter, others spend the colder months in the southwestern part of the continent or in the Mediterranean region. Geographical conditions determine several main routes. The Alps are an important barrier to migratory birds. About 150 travel westward and southwestward; others travel southeastward.

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