In the far eastern part of the state the Chihuahuan Desert dominates due to low precipitation and extremely high temperatures; some areas of the eastern part of the state are so dry no vegetation is found like the Sand Dunes of Samalayuca. There are two distinctive climate zones found in the eastern part of the state: Hot Desert (BWh) and Cool Desert (BWk) which are differentiated by average annual temperature due to differences in elevation. There is a transition zone in the middle of the state between the two extremely different climates from the east and west; this zone is the Steppe characterized by a compromise between juxtaposed climate zones.
Which city is known for its sand dunes?
Samalayuca

The United Nations Organization and its children's agency UNICEF withdrew their staff, saying that it wasn't sure the event would help its mission of raising awareness of conditions for children and amid concerns that the relay would be used as a propaganda stunt. "It was unconscionable," said a UN official who was briefed on the arguments. North Korea is frequently listed among the world’s worst offenders against human rights.
Both organizations withdrew what?
their staff

Furthermore, evidence exists that hunting may have been one of the multiple environmental factors leading to extinctions of the holocene megafauna and their replacement by smaller herbivores. North American megafauna extinction was coincidental with the Younger Dryas impact event, possibly making hunting a less critical factor in prehistoric species loss than had been previously thought. However, in other locations such as Australia, humans are thought to have played a very significant role in the extinction of the Australian megafauna that was widespread prior to human occupation.
What is thought to have played a significant role in the extinction of the Australian megafauna?
humans