Male birds of different species sing species-specific songs to attract mates.

Question

1. Male birds of different species sing species-specific songs to attract mates. Females only

mate with males that sing their species-specific song. This is an example of ________. 

a. post-zygotic isolation

b. pre-zygotic isolation

c. temporal isolation

d. vicariance

2.

Study the two phylogenies pictured below. The one on the left represents the interrelatedness among five species of flowering plants that hold nectar in a flower structure called the spur as a reward for their pollinators. The one on the right shows the interrelatedness among five species of moths that pollinate the flowers; the moth species vary in the lengths of their tongues. 

Study the two phylogenies pictured below. The one on the left represents the interrelatedness among five species of flowering plants that hold nectar in a flower structure called the spur as a reward for their pollinators. The one on the right shows the interrelatedness among five species of moths that pollinate the flowers; the moth species vary in the lengths of their tongues. 

 
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