12 Species Quotes & Sayings with Wallpapers & Posters - Quotes.Pub

Here you will find all the famous Species quotes. There are more than 12 quotes in our Species quotes collection. We have collected all of them and made stunning Species wallpapers & posters out of those quotes. You can use this wallpapers & posters on mobile, desktop, print and frame them or share them on the various social media platforms. You can download the quotes images in various different sizes for free. In the below list you can find quotes by some of the famous authors like Michael Shermer, Orson Scott Card and Charles Darwin

We shall best understand the probable course of natural selection by taking the case of a country undergoing some physical change, for instance, of climate. The proportional numbers of its inhabitants would almost immediately undergo a change, and some species might become extinct. We may conclude, from what we have seen of the intimate and complex manner in which the inhabitants of each country are bound together, that any change in the numerical proportions of some of the inhabitants, independently of the change of climate itself, would most seriously affect many of the others. If the country were open on its borders, new forms would certainly immigrate, and this also would seriously disturb the relations of some of the former inhabitants. Let it be remembered how powerful the influence of a single introduced tree or mammal has been shown to be. But in the case of an island, or of a country partly surrounded by barriers, into which new and better adapted forms could not freely enter, we should then have places in the economy of nature which would assuredly be better filled up, if some of the original inhabitants were in some manner modified; for, had the area been open to immigration, these same places would have been seized on by intruders. In such case, every slight modification, which in the course of ages chanced to arise, and which in any way favoured the individuals of any of the species, by better adapting them to their altered conditions, would tend to be preserved; and natural selection would thus have free scope for the work of improvement.