THE CORRECT AND BEST ANSWER IS 25%
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The correct answer to this open question is the following.
Although you did not attach options for this question, we can comment on the following.
The two events which ended the time of primitive society started the time of animal husbandry society were the end of humans being nomads and the beginning of the Neolithic Revolution.
When humans established between the Rivers Tigris and Euphrates, in the Middle East, they formed the first and oldest civilization on planet Earth: the Sumerians.
There, they developed new and advanced agriculture techniques and could prosper learning the times of the flooding of the rivers. That flooding left a very fertile soil to grow crops. That is why they could establish powerful city-states such as Lagash, Ur, Kish, Nippur, Uruk, or Eridu.
The Neolithic Revolution is also known as the Agriculture Revolution. That is when Sumerians started to plant seeds and domesticate animals.
Because "<span>Internal validity is the highest priority for theory-testing".</span>
Ecological
validity<span> alludes
to the degree to which the discoveries of an examination can be summed up to
genuine real life settings. While internal validity is a logical idea
that tends to the connection between two factors. It alludes to the degree that
an investigation can rule out or make improbable exchange clarifications of the
outcomes.</span>
