How can models be useful in explaining global system processes and phenomena? (Complete sentence answer)

What is the name of the type of cell division that occurs in the prokaryotic cell cycle

What type of appendages do sponges cnidarians roundworms annelids mollusks arthropods echinoderms and vertebrate have? jointed, not jointed, absent  

9. what area of study applies scientific findings to create ways for solving problems or improving life? a biogeology b mathematics c manufacturing d engineering