Options: Face validity
Content validity
Construct validity
Predictive validity.
Answer:Face validity
Explanation: Face validity is a term used in research to mean the extent or degree to which a measurement system was able to measure what it was intended to measure.
Face validity is also known as REPRESENTATION VALIDITY AND LOGICAL VALIDITY AND IT IS KNOWN TO SAVE A LOT OF TIME AND STRESS AS IT IS SEEN AS THE "COMMON SENSE" APPROACH TO DETERMINING THE VALIDITY OF A CONCLUSION.
The two discoveries that brought a revolution in early man's life are:
1) Agriculture - It helped the early man to produce its own food. this innovation made possible new flux of innovations and ideas the husbandry and domestication of all modern cattle and pets (except dogs), the formation of soldiers and wars, the money, the origin of religion, writing and all the very basis of modern life. Developing all these new outcomes would be impossible without the cooperation and organized structure of agricultural societies.
2) Language and paintings - Language helps them to communicate with each other and painting which they did at that time helped Historians today to know about their life, language, etc.
