Before telephones were created in 1876, men and women would send letter to communicate. Another way was in person. Only big companies could telegraph machine which they communicated trhough Morse Code.
Developing resources made people competent because they need to live and learn new ways to grow and become more successful in new ideas and invention. Learning how to grow crops and build houses ( structures to live ) helps people survive and live with some proctection.
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The used there engineering skills to control water flow to bring fresh water in
Answer:
Paired difference experiment
Explanation:
A paired difference experiment makes use of a paired difference test to compare two different measurements using the same unit to make inferences about population means. In other words, it is the assessment of population means by comparing two sets of measurements with the same unit,
A paired difference test can be used to assess the measurements gotten from before or after a treatment in an experiment. It can also be used to assess between controls and matching cases of diseases.
