Example sentences of "have been [verb] [prep] natural [noun sg] " in BNC.
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| 1 | On the one hand as was mentioned at the outset of this chapter and in Chapter 2 , the physical relationships which determine rates of soil erosion have been examined within natural science disciplines of hydrology , agricultural engineering and agricultural botany . |
| 2 | The problem of the evolution of recombination , and to a great extent of sex itself , is to explain why genes such as R have been favoured by natural selection . |
| 3 | Where the mucous has become distasteful , the animals bearing it have prospered , and in this way increasingly distasteful and eventually highly poisonous secretions have been favoured by natural selection . |
| 4 | Our brains have been built by natural selection to assess probability and risk , just as our eyes have been built to assess electromagnetic wavelength . |
| 5 | There are many who have suffered personal disaster and whose livelihoods have been destroyed by natural catastrophe or invasion . |
| 6 | After half a century , gas power has returned to The National Trust 's Dunster Castle , near Minehead — but this time carbide gas and coal gas have been replaced by natural gas and a sophisticated energy efficient system , which creates the perfect balance of warmth and humidity to preserve both the fabric and the valuable contents of the castle . |
| 7 | My expectations from analogy with the past , like a dog 's , are sometimes realized , sometimes disappointed ; if the mechanism were not often effective it would not as it evolved have been spared by natural selection ; but I , as a rational being , want to be able to judge when it is reliable . |