Which of the following is true of castles built during the middle ages?

a. they were constructed mainly out of stone

b. they were built by peasants to house their families

c. they were placed of refuge for nobles and peasants in time of war

d. they were difficult to destroy by fire, and therefore many survive to this day

donald carl johanson (born june 28, 1943) is an american paleoanthropologist. he is known for discovering – with yves coppens and maurice taieb – the fossil of a female hominin australopithecine known as "lucy" in the afar triangle region of hadar, ethiopia.

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result of the incas claiming exclusive right over numerous traditional routes, some of which had been constructed centuries earlier mostly by the wari empire