What is the most important part of planning your research? Not losing all the parts and pieces
Knowing and keeping track of due dates
Finding lots of sources that support your views
Writing down everything you know about your topic

Answer is in the photo. I can only upload it to a file hosting service. link below!

cutt.ly/zxt1ipy

your answer is c) experiments with water vapor showed that elements combine in specific proportions.

the development of trade during the middle age increased to the change given in the agriculture, which gave money, industry and markets a bigger importance in economy. the agriculture production was more than the consumption, which meant the creation of wider markets out of the areas. besides, with the end of multiple wars, the population increased and new trade routes were created.