factor

The closure of the mine was the single most important factor in the town's decline.

I don't think proximity is the most important factor here.

There is also the factor of location.

The greater reliability of food supplies was a factor in the decline of urban death rates.

The control of coyotes in the prairie region in the 1950s may have been a factor in raccoon expansion.

The extermination of the wolf from most of the contiguous United States may have been a critical factor in the raccoon's expansion and numerical increase.

Magnification, the increase in the apparent size of an object, is one important factor in microscopy.

Clearly some environmental factor was responsible for the greater survival rates of dark moths.

For South Island, human predation appears to have been a significant factor in the depletion of the population of moa.

One factor is the direct effect of logging, which often turns a forest into something approximating a huge pile of kindling (wood for burning): the ground in a logged forest may remain covered with branches and treetops, left behind when the valuable trunks are carted away; a dense growth of new vegetation springs up, further increasing the forest's fuel loads; and the trees logged and removed are of course the biggest and most fire-resistant individuals, leaving behind smaller and more flammable trees.

Another factor is that the United States Forest Service in the first decade of the 1900s adopted the policy of fire suppression (attempting to put out forest fires) for the obvious reason that it did not want valuable timber to go up in smoke, or people's homes and lives to be threatened.

While this factor may also contribute, observations suggest that phytoplankton populations rise and fall much more quickly than nutrient concentrations change.

The importance of any factor will vary with the particular phytoplankton species and the environmental conditions.

Another factor is albatross lay only one egg at a time.

This device proved a decisive factor in the later development of credit and commerce in northern Europe.

Now that we know much more about ancient exchange and commerce, we know that, because no one aspect of trade was an overriding cause of cultural change or evolution in commercial practices, trade can never be looked on as a unifying factor or as a primary agent of ancient civilization.

However, behavior is by far the most important factor in thermo-regulation.

The spread of this river valley agriculture in various parts of Asia and Africa was the decisive factor in the rise of the first civilizations.

The result was the extermination of a large fraction of the South American mammals, which were apparently unable to withstand the competition from invading North American species----although added predation was also an important factor.

Together with predation, it is the most important density-dependent factor in regulating population growth.

But I can imagine that…for instance, seed dispersal might be a factor.

But precisely how these factors interacted with others at play is poorly understood.

The desire to monopolize foreign trade may have been one of the primary factors behind the political unification of Egypt.

All these factors combined with the importance of reason and facts, meant readers were interested in really having a good understanding of all these changes, the changes going on in society.

Of course, there are other factors at work here.  

Several factors explain the raccoon's dramatic increase in abundance and distribution.

Different factors could have worked in concert to account for their abrupt disappearance.

Vegetation was considerably altered by the Maori occupation of New Zealand, a change not easily explained by climate variation or other possible factors.

1, 2, 3, 4, 6 and 12 are the factors of 12.

Tree densities increased from 30 to 200 trees per acre, the forest's fuel load increased by a factor of 6, and the government repeatedly failed to appropriate money to thin out the saplings.

The real wage of the average worker has increased by a factor of over ten in the last 70 years.

Haemophiliacs have no factor 8 in their blood.

The wind-chill factor will make it seem colder.

Remember to factor in staffing costs when you are planning the project.