set in motion, start an event or prepare the way for
As the human brain developed, humans initiated their own adaptations and began to overcome environmental challenges through the creation of tools. (1.1.A)
control or influence skillfully, usually to one's advantage
Chipped and flaked stone tools—including hammers, scrapers, and axes—were developed to shape and manipulate the environment, assist in foraging and hunting, and enhance food security. (1.1.A)
Chipped and flaked stone tools—including hammers, scrapers, and axes—were developed to shape and manipulate the environment, assist in foraging and hunting, and enhance food security. (1.1.A)
Fires were used to cook and preserve food, and fire enabled early humans to make more sophisticated tools, such as larger, more precisely flaked axes. (1.1.A)
a creation resulting from study and experimentation
Spoken and symbolic language made it possible to transmit knowledge within and between communities, and new knowledge promoted rapid innovations that improved hunting and gathering. (1.1.B)
of extreme importance; vital to the resolution of a crisis
The use and control of fire was crucial to human survival in cold climates, while new tools and social cooperation permitted survival in warmer and drier climates. (1.1.C)
the movement of persons from one locality to another
Human migration, in conjunction with new hunting technologies such as the spear and the bow and arrow, initiated a wave of extinctions among the mammal species in some areas. (1.1.C)