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some species form social groups only with members of the same gender. for example, elephants form groups with only
females and their offspring. once the male offspring reach a certain age, they leave the group and become solitary.
which is a benefit of this type of social group structure?
females do not have to compete for a mate.
male offspring can belong to more than one social group
adult males can mate with females in several different social groups.
females are the only ones responsible for taking care of the offspring

the process is called revolution because it was a process of great economic-social transformations that began in england in the xviii century.

the industrial mode of production spread throughout much of the northern hemisphere throughout the xix and early xx centuries.

the effect of this revolution was the distance between the countries, with respect to economic and political power.   after all, not all industrialized at the same time, remaining in the condition of suppliers of raw materials and agricultural products to the industrialized countries.

these differences mark to this day the nations of the world that are divided between developed and developing countries. one way to measure whether a country is advanced is to assess how industrialized it is.

an early twentieth-century ad for model home blueprints

) the chinese armed forces had been removed from the city