Do all plz thank you! Give 20 points to who answers correctly

How does buring fossil fuels impact does carbon cycle? what large impact does this have on the envirnment?

How does the study of genetic disorders such as pku biologists understand normal alleles?

And give a detailed description! scientist observes the boundary between two tectonic plates for a decade and finds that no new volcanoes have formed over the course of her investigation. does this result support the theory of plate tectonics? why or why not?