All living things (plants, animals, humans) have the ability to absorb nourishment, to grow, and to propagate. All ‘living creatures’ (animals and humans) have in addition the ability to perceive the world around them and to move about. Moreover, all humans have the ability to think – or otherwise to order their perceptions into various categories and classes. So there are in reality no sharp boundaries in the natural world. We observe a gradual transition from simple growths to more complicated plants, from simple animals to more complicated animals. At the top of this ‘scale’ is man – who
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