. Which of the following lists the divisions of the geologic time scale in order from longest to shortest? * a. era, period, epoch
b. epoch, period, era
c. era, epoch, period
d. period, era, epoch

halogen, any of the six nonmetallic elements that constitute group 17 (group viia) of the periodic table. the halogen elements are fluorine (f), chlorine (cl), bromine (br), iodine (i), astatine (at), and tennessine (ts).

if the type of the food available changes, then the frequency of beak types will change, because birds with beaks more suited to the available food will be more successful over time.