id	author	title	date	pages	extension	mime	words	sentences	flesch	summary	cache	txt
work_33zfmlpop5evhlx53zmi7z2bg4	Timothy Shanahan	Beatty on Chance and Natural Selection	1989	7	.pdf	application/pdf	2691	152	56	On this interpretation natural selection could be understood as sampling on the basis of such fitness differences, and random it is difficult to maintain that the predation of dark moths on light trees difficult to distinguish natural selection from random drift, especially Beatty locates the difficulty in the moth example as that of distinguishing between natural selection and drift, since each possibility seems problematic. be the relevant environment of the dark moths that were killed. The problem of identifying the relevant environment, while often difficult, is not obviously a conceptual problem but rather involves the difficulty of correctly isolating and weighting the causal factors connecting fitness of an organism changes, as its relationships to various environments change, through time. These factors, in effect, "screen off" less relevant causal factors (such as the patchiness of the forest as a whole) from the moths' survival and reproductive question raised by the moth example is not whether drift and selection 	./cache/work_33zfmlpop5evhlx53zmi7z2bg4.pdf	./txt/work_33zfmlpop5evhlx53zmi7z2bg4.txt