同样，如果一种植物或动物没有留下任何可以繁殖的后代，它就不能把所有的能量浪费在使自己变得更强壮上，因为这是最可能走向灭绝的方式。
Similarly, a plant or animal cannot squander all its energy on growing a big body if none would be left over for reproduction, for this is the surest way to extinction.
当另一种植物获得化学物质时，它就会开始释放自己不同的化学物质。
When another plant gets the chemicals, it starts to give out its own, different chemicals.
而当这种植物和与自己没有亲缘关系的凤仙花共用一个花盆时，它们就会使劲长出更大的叶子，好与这个非亲非故的邻居竞争。
But when those same impatiens were planted with other impatiens—but not their siblings—they put more energy into growing more and larger leaves that could crowd out the nonrelatives.
应用推荐