Which group of skilled workers fought for better pay and working conditions in philadelphia?

The group of skilled workers that fought for better pay and working conditions in Philadelphia was Knights of Labor.

Explanation:

The Knights of Labor was a work organization in the United States from 1869 to 1949. It was a right-wing movement based on republican ideology, opposed to socialism and radicalism. In the 1880s, the Knights of Labor was the largest and most influential workers' organization in the country, with over 700,000 members at its best. From the 1890s onwards, its membership declined so that when the organization ceased operations in 1949, there was only one 50-member division.

The Knights of Labor started out in Philadelphia as a secret society like the Freemasons, but in 1882 dropped its references to the "fraternity" and at the same time gave up its member rituals. The organization's first main organizer was Terence V. Powderly, of Irish background, and most of its members were Catholic in his own way. The Knights of Labor did some of the same things as the leftist labor movement. These included, inter alia, eight-hour working hours, a ban on child labor and general wage increases. However, its range of tools did not include strikes, but claims were sought through boycotts, for example. The ultimate goal of the movement was workers' cooperatives.

and whats your questoin

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.'