If the same base pairs are used to code for all organisms, why is there so much variation among organisms?

Which of the following was not a major animal on land during the carboniferous period? amphibians insects both a and b none of the above

Can someone give me the answers to this?

Select the correct answer from each drop-down menu the images show fossils of a modern bird and two extinct organisms (a tyrannosaurus rex and an archaeopteryx). based on the structure of the three organisms, it can be concluded that the archaeopteryx and bird have wings, while dinosaurs have limhe se it can be concluded that