Hey there,
Answer:
Van Helmont - He concluded that trees gain most of their mass by absorbing water
Priestley- He found out that plants release oxygen
Ingenhousz- He concluded that plants needs sunlight to produce oxygen.
Hope this helps :D
<em>~Top♥</em>
Answer:
A case study
Explanation:
Case study: In psychology, the term case study refers to one of the research methods which is considered as a descriptive research that is being used by various researchers or experimenters to get an in-depth examination of a group, person, or phenomenon. A case study involves significantly different approaches including psychometric tests, personal interviews, archival records, and direct-observation.
In the question above, the given research method is called a case study.
Answer:
Easier to trade/get more materials
Explanation: To get more materials to build the cities, you need an effecent way to do it, which is why you need to be near a railraod. Most people would also trade, and railroads are easier to trade with. People also need to travel, and it's faster when you're near a station.
<span>based on or relating to a system of ideas and ideals, especially concerning economic or political theory and policy.</span>
