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I put this here because this is where the Neolithic era starts.
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This is important because animals are now used for work. And plants are also being grown
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I put this here because people can now use tools to catch food, protect themselves, etc.
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Animals are now used as a food source so people can feed themselves. Then later pigs and cattle will be used for work as well.
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The obsidian and volcanic rock are used to make stronger tools that would last them longer. Wheat, vegetable, and barley are grown to make food.
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Plows are used to replace the use of a digging stick. The plow makes it easier to dig the ground and plant things.
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The copper tools replace the stone tools so they are even stronger. Then eventually all groups will move onto copper,bronze, and/or iron tools.
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More food/spices are grown in the Indus Valley. Fruit juice, sugar, etc were already being grown in India.