Evolution is regarded as a branching process, whereby populations are altered over time and may speciate into separate branches, hybridize together, or terminate by extinction.
进化被视为一个

程;随着时间的推移,种群发生改变,种群
可能进化成为
,
可能相互杂交或

止。
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Yes, we have now domesticated pecans as a nut tree and blueberries as a fruit, and we have improved some Eurasian fruit crops (apples, plums, grapes, raspberries, blackberries, strawberries) by hybridizing them with North American wild relatives.
是
,我们现在已经驯化山核桃作
坚果树,驯化蓝莓作
水果,并且通过与北美野生
缘种杂交改良了一些欧亚水果作物(苹果、李子、葡萄、覆盆子、黑莓、草莓)。