Answer:
Explanation: The black plague also known as the bubonic plague is called yersinia pestis. It spread to mammals including humans and it spread west from Asia to Europe via traders that were using the Silk Road.
Answer:
Lincoln's election was seen as the last straw to the Southerners about their place in the union. This led to the process of secession a short time later, also leading to the eventual Civil War.
Answer:
Cross sectional research
Explanation:
Cross-sectional research involves using different groups of people who differ in the variable of interest but share other characteristics, such as socioeconomic status, educational background, and ethnicity. It analyzes data of variables collected at one given point of time across a sample population.
Answer: Observer - expectancy effect.
Explanation: Dr. Larsen being the observer or experimenter may subconsciously introduce a sort of cognitive bias into the experiment resulting the wrong or incorrect interpretation of the result or outcome of the experiment such that it conforms to their hypothesis. Observer-expectancy bias also called experimenter-expectancy bias can be controlled by adopting a method in which observer or experimenter is blind to the experiment's condition and thus the observer's expectation regarding the hypothesis is conained or controlled.
