in some years, a population of black-capped chickadee experience very cold winte
ID: 112010 • Letter: I
Question
in some years, a population of black-capped chickadee experience very cold winters such that only those chickadees that have a larger body mass are able to make it to breeding season. In years with warmer winters, however, chickadees that have a larger body mass are more susceptible to predation. If body mass is a heritable trait, what can you predict about the average body mass of the population over time?
A) The average body mass will always increase
B) The average body mass will always decrease
C) The average body mass will both increase and decrease
D) The average body mass will not change
Explanation / Answer
as we know that black-capped chickadee are able to make it to breeding season and larger body mass are more susceptible to predation for chickadee . from the evolution theory we know that which part of our body is useless for us its geeting extinct after some time like tail in the humans and which part of our body we used so much or beneficiary for us its getting increase with the time like the strength of human mind from ancient time to present. here we can see that larger mass is beneficial fo the black-capped chickadee in the winter years . so we can say that mass will be increasing in future nut we also know that that have a larger body mass are more susceptible to predation so according to the theory mass should be decrease. but larger mass give both advantages and disadvantages to black-capped chickadee. so we can say that mass will remain unchange because if mass has been increase in future then black-capped chickadee will not able for the predation and if mass has been decrease in the future then black-capped chickadee will not able to breeding so current siyuation of their mass is perfect for the black-capped chickadee .
so the right option for the question is
(D) The average body mass will not change
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