All australopithecines and Homo habilis are found only in _______. Fill in the blank(s) with the appropriate word(s)
Africa
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Calculate the power requirement in horsepower for an escalator in a mall that transports 50 people with an average of weight of 170 lbf (756 N) a vertical distance of 30 feet (9.1 m) in 25 seconds.
What will be an ideal response?
What three reasons are used to explain the possible emergence of a Stage 5 epidemiologic transition?
A) poverty, increased knowledge, evolution B) poverty, evolution, increased connections C) wars, evolution, lack of financial aid D) wealth, evolution, increased connections E) wealth, increased connections, less productive agriculture
Competition
What will be an ideal response?
A skillet is lined with a thin layer of cooking oil followed by a layer of unpopped popcorn kernels. Upon heating the kernels, all pop thereby escaping the skillet. Which of the following physical and/or chemical changes occurred?
A. The water within each kernel is heated to the point that it would turn into water vapor as the kernels popped (physical change). B. The starches within the kernels are cooked by the high temperatures (chemical change). C. Both A and B occur. D. Physical and chemical changes cannot occur without a real chemical reaction taking place.