If you are asking what characteristics of the plants made
them "better," the main answer is the size of the plants' seeds. Diamond talks about
how many of the plants in the Fertile Crescent were among the wild plants that had the
biggest seeds. Plants with big seeds are better because the seeds are the things that
people eat (if we are talking about grains). You can find this in Chapter
8.
If you are asking why Eurasia had the plants rather than
some other place, the answer is luck. One thing Diamond is trying to argue in this book
is that some places were just luckier than others in terms of plants and animals that
were available to them and in terms of their geography.
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