The Appalachian mountain range in North America is marin age and rock composition to mountain ranges in Britain and Norway. Similarly, a mount range that runs east to west South Africa matches a mountain in Argentina which theory does this evidence? A. Mountain building occurred at the same time in different regions.
B. Continents that are now separated were once joined together.
C. Erosion destroyed mountain ranges connecting seperated continents.
D. Regions with similar climates show similar geological activity.

- lead + phosphoric acid = hydrogen + lead(ii) phosphate

answer: atomic mass was originally used to arrange elements on the periodic table, but is no longer used to organize the modern version.

explanation:

originally atomic mass was used to arrange elements on the periodic table from left to right in a row. each column then shows similar properties of elements of a group.

in modern periodic table, the atoms are arranged in increasing atomic number. as atomic number represents the number of protons in an atom which is unique for every atom.  

alchemy hadn't scientific methods of study, appeal to mysticism and fantasy, the knowledge of chemistry and physics were modest at that time.

alchemy was - but as new rules were discovered it either changed into chemistry or it became "unscientific".