An executive of a startup company thinks that a special vitamin will increase the productivity of workers. 100 workers are randomly chosen and divided into two groups of 50 workers each. Each group is assigned the same task, which is to staple stacks of papers. Group A is given the special vitamin before they begin working. Group B is not given the special vitamin. After an hour the executive counts how many stacks of papers each group has made. Group A made 1,587 stacks and Group B made 2,113 stacks of papers. Identify each of the parts of the scientific method in the experiment by filling in the example

The pattern of this wave changes between its beginning and end. what is true about the amplitude and wavelength of the wave when the pattern changes?

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Juan and carol were studying invertebrates in biology. they knew that segmented or earth worms preferred a dark, moist habitat. during this lab, they would be investigating the responses of organisms called planaria or dugesia tigrina. these were simple flatworms that still had a one-way digestive system and a very simple nervous system. juan and carol placed the planaria in a petri dish containing cool, distilled water that was partially covered with black paper. they shined a light on the dish. next, they removed the paper and placed a small amount of chicken liver at one end of the dish. they added a few large salt crystals to the water. finally, they added drops of hot water to the cool water in the petri dish. their results can be seen in the data table. according to their experiment, all but one conclusion is valid.