Diffusion
a. refers to the taming and changing of plants and animals by humans.
b. refers to the securing of more food and resources from a smaller area of land than was possible with a gathering and hunting technology.
c. refers to the slow colonization of new lands by agricultural peoples as growing populations and pressures to expand pushed them outward.
d. refers to the gradual spread of the techniques of agriculture, and perhaps the plants and animals themselves, without the extensive movement of agricultural people.
Answer: d. refers to the gradual spread of the techniques of agriculture, and perhaps the plants and animals themselves, without the extensive movement of agricultural people.
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Fill in the blank(s) with the appropriate word(s).