Some scholars have argued that there is no coherent basis for treating tribes as ‘pristine’ – i.e., original or pure – societies uncontaminated by civilization. The idea that tribes are like stone age hunting and gathering societies that have remained untouched by time is still common, even though this has not been true for a long time. Based on the above passage, justify with four reasons why this idea of tribes having remained untouched is untrue.

A ladder of fixed length \( h \) is to be placed along the wall such that it is free to move along the height of the wall.
Based upon the above information, answer the following questions:
(iii) (b) If the foot of the ladder, whose length is 5 m, is being pulled towards the wall such that the rate of decrease of distance \( y \) is \( 2 \, \text{m/s} \), then at what rate is the height on the wall \( x \) increasing when the foot of the ladder is 3 m away from the wall?