The development of cotton and woolen mills in the mill cities of England, and later New England, caused tremendous sociological change as potential workers (especially women) swarmed from rural areas to the growing industrial cities. Cite some examples of similar occurrences in more recent times in developing countries.

Explanation:

Agribusiness is the strongest sector of the Brazilian economy, for this reason there is a change in the flow of workers who migrated from the southeastern region of Brazil where the largest Brazilian metropolises such as Rio and São Paulo are concentrated to the central west region of Brazil, where there is the largest agricultural productivity in Brazil.

The high investment and industrialization in the region, the strengthening of Brazilian agribusiness and the lack of employment in other regions of the country were the causes that contributed to the greater demand for jobs in the central west region of the country.

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ans.

heterothermic organisms include those organisms that can switch between homeothermic (having body temperature higher than environment) and poikilothermic (having variation in internal body temperature) strategies.

some migratory birds show heterothermy as they decrease their metabolic rate during cold nights to keep their body temperature low. drop in metabolic rate allows increase in production efficiency of birds that reduces the internal body temperature to make it equal to external cold temperature during cold nights.

thus, the correct answer is 'birds allow their temperature drop in order to increase their production efficiency.'