Final answer:
It is true that environmental changes at the end of the last glaciation led to AMHs developing a broad-spectrum economy, diversifying their sources of food and adapting to a rapidly changing world.
Step-by-step explanation:
It is true that a broad-spectrum economy was developed by Anatomically Modern Humans (AMHs) because of environmental changes at the end of the last glaciation. The warming of Earth and the retreat of the glaciers around seventeen thousand years ago caused significant habitat changes: submerging continental shelves, creating new lakes and rivers, and altering the distribution of both plant and animal life. This shift in climate enabled the diversification of the human diet by creating access to a wider variety of animals, as certain species adapted to different climates and others went extinct. The extinction of megafauna, such as the woolly mammoth, could be correlated with the arrival of human hunters in some cases, although the overall causes of these extinctions are a combination of human activity and environmental changes.