...The two constant factors were the river and the great dry country on either side... 
Stewart Edward White 「African Camp Fires」
...Many factors were involved that were quite foreign to the older woman's nature and training...
W. E. B. Du Bois 「The Quest of the Silver Fleece」
...—The buffalo of the past was ananimal of a rather low order of intelligence, and his dullness ofintellect was one of the important factors in his phenomenally swiftextermination...
William T. Hornaday 「The Extermination of the American Bison」
...Food is obtained by a variety of methods depending on the type of food, age of the cottonmouth, and possibly other factors...
Ray D. Burkett 「Natural History of Cottonmouth Moccasin, Agkistrodon piscovorus (Reptilia)」
...As with any species there is a wide range of individual temperament, which is affected by many factors...
Ray D. Burkett 「Natural History of Cottonmouth Moccasin, Agkistrodon piscovorus (Reptilia)」
...Although parasitic infestation causes discomfort and may lower resistance to other detrimental factors, it is difficult to attribute death to the effect of any particular kind of parasite...
Ray D. Burkett 「Natural History of Cottonmouth Moccasin, Agkistrodon piscovorus (Reptilia)」
...The diel activity cycle likewise depends upon temperatures but is influenced by other factors as well...
Ray D. Burkett 「Natural History of Cottonmouth Moccasin, Agkistrodon piscovorus (Reptilia)」
...Gross climate and topography, through their influence on vegetation, are the prime factors in the distribution and kinds of birds in the State...
Emil K. Urban 「Birds from Coahuila, Mexico」
...It should beemphasized that the factors leading to northward migratory movementmay be involved in timing of the annual gonadal and reproductivecycle...
Richard F. Johnston 「The Breeding Birds of Kansas」
...The insect's industry, variable in its details by sudden, individual and non-transmissible innovations, gives the lie to the two great factors of evolution: time and heredity...
J. Henri Fabre 「Bramble-bees and Others」
...Or possiblythese factors or the need to find food and securityovercame the homing tendency...
Thomas F. Weise 「An Experimental Translocation of the Eastern Timber Wolf」
...These two contrasting typesof vegetation overlapped widely in an interdigitating pattern whichwas determined by distribution of moisture, soil types, slope exposureand various biotic factors...
Henry S. Fitch 「The Forest Habitat of the University of Kansas Natural History Reservation」
...If such factors are taken intoaccount the ages of trees may be estimated from the diameters of theirtrunks...
Henry S. Fitch 「The Forest Habitat of the University of Kansas Natural History Reservation」
...In them, pale soil and low relative humidity are importantpassive factors of selection that give adaptive value to the palecolors of pelage of both infernatis and handleyi...
Robert L. Packard 「Speciation and Evolution of the Pygmy Mice, Genus Baiomys」
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