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A primary source is like a diary of somebody that has experienced something or the person them self (autobiography) A secondary source is when somebody has heard the story and retells it or writes about it. (biography) A primary source is the most reliable because information can be lost or changed by a secondary source so historians favor primary sources.
Historians will examine a second hand source of a historical event. If the second hand source matches up to other sources of information, then each source in a certain manner adds to the credibility of the historical event.
A tapestry could be used as a primary source. The fabric used and the theme can tell historians a lot, but not the entire story. Example is the Unicorn Tapestries are among the most beautiful and complex works of art from the late Middle Ages. There is a lot of symbolism in the work and yet historians have to guess at meanings and who made it. To understand sources historians have to understand what happened in history the Bayeux tapestry does exactly that .
source to understand bronze age in early China
Isolate the problemCollect source materials, including primary and secondary sourcesEvaluate source materialFormulate hypothesesReport and interpret findings
Lysosome. Which fails to produce the enzyme lactase. (source : medical forum)
two coherent light sources are produced by splitting a single light source
The beta cells of the pancreas produce insulin and C-peptide, a byproduct of insulin. Source: Wikipedia
Sound is sensed only when vibrations produced by a source is transferred to the ear drum by means of a material medium. If such a medium is absent then sound cannot be heard. But vibrations of the source are always there.
sound produced through the vibrating object .
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Chlorophyll :')) -- Via MebApp.com
They use primary and secondary sources
It is a source which does not produce light.
Cholesterol is a waxy steroid of fat that is produced in the liver or intestines. It is used to produce hormones and cell membranes and is transported in the blood plasma of all mammals.
Historians will help us.