Do all investigation have to have a hypothesis?

Are large areolas unattractive? Which theory was helpful to Darwin in the formulation of his theory of evolution? How many meters are in 211cm? What is consensual validity? How much energy is passed from one level to the next in a food chain food web or energy pyramid? A graph of stars showing temperature on the x-axis and brightness on the y-axis is a? Why is oxygen considered to be a by-product of photosynthesis? What is one scientific law or theory that has changed over time? Is 2.063 kilometers longer than 2.07 kilometers? Do plants keep us alive? How does the esophangas? What is an accepted and universally true explanation of observed facts? What is the difference between dirty and filthy? Which structural feature will differ among an ester an alcohol and an aldehyde regardless of which regardless of which examples are being compared? What is the six steps of the scientific method and there order? What is one Newton defined as? What does a fasting blood draw test for? Minerals may break across planes due to their atomic arrangements What is the term used for this type of break? What does T.O.M.A.C.R.U stand for? Explain the general dependence ot accuracy and precision on the various type of errors?