A catalog is a List of goods or services on sale with their description and prices published as a printed document, or as an electronic document, and like say you get a magazine from walmart it is just things for sale nothing else
To give credit to the person from the person you are taking information from.
Answer is D, im pretty sure. It sounds wrong using the.
Answer: He argued that observation and experimentation are the most important tools for understanding the natural world. ... It caused people to take a new, logical approach to scientific discovery based on experimentation and observation.