Because the time was going fast
The answer is explicit.
Implicit and implied both mean that the statement requires some amount of interpretation, and exposed doesn't work as well as explicit.
Answer:
The author would use Encyclopedia Britannica as a secondary source to acquire reliable data about da Vinci's employment with Sforza.
Explanation: This is a secondary source because it is evaluating tons of data in order to draw a conclusion about the issue. The source is not performing new research or experimentation but is commenting on existing information out there. Since this issue is regarding a technology that is not yet fully developed and because the research is still new, it is more appropriately covered by a secondary source. As a quality secondary source, it is able to compile myriad factors and studies in order to draw an interpretation or make predictions that might otherwise be impossible to see using only an isolated experiment.
Answer:
the brain activates a cascade of reactions that prime us either to battle for our lives or to escape as quickly as possible — a reaction in mammals that is known as the "fight-or-flight" response.
Explanation: