if they themselves participated in or saw the event take place, it's a primary source.
if they HEARD it from someone who participated/saw the event, it's secondhand information, and therefore a secondary source.
Ask someone smart
A primary source is a document, speech, or other sort of evidence written, created or otherwise produced during the time under study. Secondary sources provide interpretation and analysis of primary sources.
According to Honda and other sources, there were a total of 18,865 NSX's produced worldwide during its entire production run (1990-2005).
The sugar produced during photosynthesis is glucose.
Disk throwing
During fasting the glucose is relaesed from intracellular glycogen stores in the liver (produced by glucogenolysis). After a meal blood glucose is acquired from the diet.
There are a few energy carrier produced during Glycolysis but NADH and ATP are most produced.
United states and Great Britain
Which gulf war. The US participated in three of them.
Carbon Dioxide (C2O) and Alcohol are produced by yeast during fermentation.
No proteins are produced by photosynthesis.
The name of the force which is produced during punching is known as the punching power.