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.
Explanation:
At first, domesticated plants and animals were spread via contagious diffusion which is what happens when people in a certain area or locale come into contact with another.
When the Europeans began to explore and colonise the rest of the world, they engaged in relocation diffusion by taking the plants and animals they knew to the new areas and then taking the plants and animals from the new areas back to Europe. This was how domesticated plants and animals spread across the world.
