The answer is b how bird choose were to build there nest
Answer:
A market for cats would have had a positive externality.
Because the cats would kill the rats on sight since that is their natural behavior.
However, it is interesting to mention, that the cat's killing has been more of a "mythic" aspect of this story, since it fails to take into account that since the black death was caused by the<em> yersinia pestis</em> bacteria, cats could have been also infected, and since their interactions with humans are greater than rats or fleas, the real outcome could have been totally unexpected.
This is the hierarcy of a combination of concepts: social status, economics, privilege, and being a minority or majority. Politics is the science of how human social status and the degree of wealth a person has can affect the life they live. Politicians are meant to represent the people. They are citizens just like us with different family backgrounds but they have the privilege of being leaders. This means they often decide who gets what when and how.
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they mostly established an federal government