The answer to this question is C)were the first American
Explanation:
The engine consists of a fixed cylinder and a moving piston. The expanding combustion gases push the piston, which in turn rotates the crankshaft. ... After the piston compresses the fuel-air mixture, the spark ignites it, causing combustion. The expansion of the combustion gases pushes the piston during the power stroke.Nov 22, 2013
Before the fifteenth century, European states enjoyed a long history of trade with
places in the Far East, such as India and China. This trade introduced luxury goods
such as cotton, silk, and spices to the European economy. New technological
advancements in maritime navigation and ship construction allowed Europeans to travel
farther and explore parts of the globe that were previously unknown. This, in turn,
provided Europeans with an opportunity to locate luxury goods, which were in high
demand, thereby eliminating Europe’s dependency on Eastern trade. In many ways,
the demand for goods such as sugar, cotton, and rum fueled the expansion of European
empires and their eventual use of slave labor from Africa
Observational methods, case-study methods and survey methods.
Observational Method
With the observational method (sometimes referred to as field observation) animal and human behavior is closely observed. There are two main categories of the observational method — naturalistic observation and laboratory observation.
Case Study Method
Case study research involves an in-depth study of an individual or group of indviduals. Case studies often lead to testable hypotheses and allow us to study rare phenomena. Case studies should not be used to determine cause and effect, and they have limited use for making accurate predictions.
Survey Method
In survey method research, participants answer questions administered through interviews or questionnaires. After participants answer the questions, researchers describe the responses given. In order for the survey to be both reliable and valid it is important that the questions are constructed properly. Questions should be written so they are clear and easy to comprehend.
