Answer C: Both domesticated plants and animals spread across the globe through contagious diffusion in early years by farmers and traders, and later by relocation diffusion through European exploration and colonialism. Answer B: Domesticated plants spread through wind-borne dispersal of seeds from their original hearth, expanding slowly until a vast region was covered with new plants. Which of the following best explains the diffusion of plants and animals from their hearths of domestication? Answer A: Animals were domesticated before plants and diffused rapidly from their hearth of domestication through contagious diffusion because they were mobile and moved easily from place to place.
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