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What is the relationship between the change in migration pattern and the evolution of physical characteristics of the U.K. blackcaps?

User RWDJ
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It emerged that Britain- and Irish-wintering Blackcaps are able to fatten up fast before migrating back to their breeding grounds and make a speedy return journey (arriving back around 10 days earlier than their competitors) - another possible advantage of having predictable food at hand (or cla
User Daysha
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Answer:

Females that were coupled to British males produced more eggs and chicks than those who were matched to southern birds. Every year, blackcaps with Britain-oriented genes pass on their genes to new chicks. As a result, the number of blackcaps willing to fly to Britain is constantly increasing.

Step-by-step explanation:

Females that were paired with males from the United Kingdom produced more eggs and chicks than those who were paired with males from the United States. Every year, British-oriented blackcaps pass on their genes to new chicks. As a result, the number of blackcaps eager to fly to the United Kingdom is growing all the time.

User Ziriax
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