WHAT IF COMPLICATED ORGANS, SUCH AS THEEYE , ARE SELECTED FOR THE ADVANTAGE THEYPROVIDE, HOW CAN THEY BE GENERATED BY ASINGLE DNA CHANGE ?SURELY SUCH COMPLEX ORGANS WILL BECREATED BIT BY BIT OVER GENERATIONS?BUT HOW CAN EACH INTERMEDIATE CHANGE BESELECTED FOR?THERE ARE A NUMBER OF POSSIBLEEXPLANATIONS
• EVEN AT AN INTERMEDIIATE STAGE , SUCH ASRUDIMENTARY EYE , CAN BE USEFUL TO SOME EXTENT. THISMIGHT BE ENOUGH TO GIVE A FITNESS ADVANTAGE•IN FACT , THE EYE LIKE THE WING - SEEMS TO BE A VERYPOPULAR ADAPTATION.•INSECTS HAVE THEM, SO DOES AN OCTOPUS AND SO DOTHE VERTEBRATES.•AND THE STRUCTURE OF THE EYE IN EACH OF THESEORGANISMS ARE DIFFERENT – ENOUGH FOR THEM TO HAVESEPARATE EVOLUTIONARY ORIGINS.
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The beaver has many interesting adaptations. They have long, sharp incisors that never stopgrowing, so as they wear them down chewingtrees, they keep growing back.They can also close their nostrils and .throat while carrying sticks around inthe water. This keeps them fromdrowning while they carry sticks to andfro underwater.
They have a thin membrane over their eyesthat allows them to see underwater whileprotecting their eyes like swim goggles!They also have a thick coat so they canswim under the ice in the winter and oilglands to keep their fur well oiled. Thebeaver is well adapted to its habitat