Who invented the division of labour?

A certain dog whistle operates at 23.5 kHz while another brand operates at an unknown frequency When they play together they have a frequency of 5000 Hz Estimate the operating frequency of Brand X? What are different type of PERL variables? What modern method of steel manufacturer bypasses the ingot stage and produces slabs or blooms directly? What simple machine is front teeth? How is garbage collection done in c plus plus? Who is Joseph valleyJoseph valley is a great great great grandfather he was the first valley and lived James Madison was alive in 1678 A.D.? Is construction paper a insulator? Does the University of Wyoming Carry Nao? Changing a word to all uppercase letters in c plus plus? Why did they invent toilets? In capacitive reactance how its formula can be determined in easy way. please answer? The effect of a default argument can be alternatively achieved by overloading Discuss with an example Can you solve the above program using default arguments? How much current is needed to produce 50 mA of current through a 240Ω resistor? What is the readings you get when you do megger test? What are the best and where do I find more info on pvc pipe? Can electronics in standby mode consume same energy or power? Who invented bifocals the lending library and an efficient heating stove? What is the difference between design and implementation? What is an over-current protective device? Opening in a wall to let air in or out?