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What was found at Olduvai gorge?
From the late 1930s, Louis and Mary Leakey found stone tools in the Olduvai Gorge and elsewhere, found several extinct vertebrates, including the 25-million-year-old Pronconsul primate, one of the first and few fossil ape skulls to be found. Their work at Olduvai Gorge had been interrupted by political uprisings in nearby Kenya, but late in the 1950s, they returned. The Leakeys were interested in prehistoric tools, but more and more wanted to find evidence of the people who made them. In 1959, they did.
When did people start using slaves?
Slavery is mentioned in some of the oldest human writing. It is mentioned in the Hebrew Bible and New Testament, and is covered in detail in Qur'an. The Egyptians, Greeks, Romans, Chinese, and many other ancient empires had slavery.
The Columbian Exchange was named after?
The Columbian Exchange also known as the Grand Exchange was a dramatically widespread exchange of animals, plants, culture, human populations (including slaves),communicable disease, and ideas between the Western and Eastern Hemispheres following the voyage to the Americas by Christopher Columbus in 1492. The term was coined in 1972 by Alfred W. CrosbyWikipedia
Why was slavery tolerated when the united state was found?
The idea that all men were created equal was not prevalent at the time. Basic human rights were not established. Therefore, practices such as slavery were not illegal and not largely objected to.
How do tears act as barriers against harmful organisms?
Human tears contain the enzyme lysozyme which disrupts the cell walls of gram-positive bacteria by digesting the peptidoglycan in it. This enzyme can also be found in your saliva.
