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If evolution is random mutations... why do so many species(seemingly vastly different in stages of evolution) carry such similar traits such as eyes to see and ears to hear? and often they are symmetrical and in pairs?
It must have taken quite a few generations of "random mutations" to develop complex(or even simple) sensory systems like eyes and ears. I doubt these changes all happened at once to produce a single generation suddenly possessing ears or eyes. So how did mother nature know to keep certain "random" changes and add to or modify them in order to create ears or eyes without ever initially knowing that such a thing as sound waves and light exist to be interpreted?
common ancestor species way back in history and simplest solutions to problems. humans and domestic cats both have eyes; and that's because all mammals have evolved from common ancestor species in the triassic which we presume had similar eyes to both humans and cats. humans and octopuses both have eyes; but they come from almost totally different genetic pathways; ie they have developed separately (we can see differences in the eyes that show disparate basic evolutionary steps) as a cool mechanism for gaining an advantage over competitors.
If evolution is random mutations... why do so many species(seemingly vastly different in stages of evolution) carry such similar traits
why ... symmetrical and in pairs?
Certain components of the eye, such as the visual pigments, appear to have a common ancestry – that is, they evolved once, before the animals radiated. However, complex, image-forming eyes evolved some 50 to 100 times – using many of the same proteins and genetic toolkits in their construction.