Sophia rides her bike to and from school. Sophia's bike has a special tape that reflects energy from the sun to make it easier for cars to see her. She also uses a bell to let other bikers know if she is going to move past them. Which of the following forms of energy does Sophia NOT use when biking? 1.mechanical energy
2.sound energy
3.light energy
4.electrical energy

To what is the growth of civilization most clearly traced

In 1914, alabama produced 1.7 million bales of cotton, but three years later produced only 515,000, bales. meanwhile, in georgia, 5.2 million acres of land was dedicated for cotton production in 1914, but by 1923 there were just 2.6 million acres used for growing cotton. all of this was the result of the work of a tiny insect: the boll weevil. alabama and georgia first felt the effects of the boll weevil at different times. what would account for this difference in timing?

Donald is studying the eating habits of all students attending his school. he samples the population by dividing the students into groups by grade level and randomly selecting a proportionate number of students from each group. he then collects data from the sample. which type of sampling is used? select the correct answer below: systematic sampling convenience sampling stratified sampling cluster sampling