As a scientist, inventor and engineer, Leonardo da Vinci used a methodical approach to study topics, including a. built and tested many designs of his engineering inventions.
b. drew precise illustrations with detailed descriptions about the subject.
c. relied on others’ inventions and improved upon them.
d. brainstorming on the topic and conducting one test.

alliances in ww1 were different from ww2 because the entente in ww1 made up of serbia,russia,france,britan,japan and italy later america  and all allied in a sort of balance of power and too keep germany,austria-hungary,and the ottomans down. russia allied the serbians in order to exert its influence in the balkans while france allied the russians because france was still in dismay and insulted after the defeat to the germans during the unification of germany and britian allied the belgians after the germans invasion of belgium.in ww2 the alliances were in a preemptive attempt to deter any further wars into happening while germany and italy allied since they were insulted and humiliated after the previous war while also sharing a similar ideology of facsim along with japan which all 3 had a want for world domination and agreed to assist one another in the endevours 

explanation:

the word that best sums up the tone of the newspaper regarding the treaty of versailles is resentful.

b: the exchange of coined money

battle of the bulge, but are there any multiple choice options?