History I / Big History and Environmental History
Practice question · Multiple choice

Why does a continent’s east–west axis matter for the diffusion of crops and animals?

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  1. What is a crop adapted to?
  2. What changes as you move north or south?
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C. Domesticates spread along a shared latitude and climate band

Why

Crops track latitude, day length and temperature. Eurasia’s east–west span let a domesticate travel thousands of kilometres inside one band; the Americas and Africa force every diffusion through climate zones that kill it.

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