The Gross National Product (GNP) of USA between 1940 to 1945 more than doubled .
The GNP rose from $91 billion in 1939,to $105 billion in 1940 to $126 billion in 1941,to 193 billion in 1943, to $214 in 1945 .
Now if see the GNP jump from 1940 to 1944 is from $105 billion to $214 billion which is more than double.
I believe the answer is: <span>bones and stones
The utilisation of metal as materials to made tools did not begin until the Neolithic period (approximately 2000 years after the Mesolithic period)
</span><span>So, bones from wild animals and stones are the only material that they know to be strong/hard enough to be made as tools.</span>
Answer: The Zone of Proximal Development
The zone of proximal dev is the difference bet what a kid can do with help and what they can do without help. Vygotsky found that a child follows the adult example and learns to do things independently in stages, this is referred to a scaffolding.
