What change cannot be made?

What is the name of the scientific law air pressure and volume? Light will almost always travel from one place to another along a path of least? Can chemical poisoning be prevented? How many liters are there in one millimeter? How do computers help astronomers understand what happens when galaxies collide? What climate seldom rise above freezing? What describes how matter moves between producers consumers and decomposers in an ecosystem? How were the limestone formations in the White Desert created? How long do you flush chemical burn? In which part of a root is a vascular tissue found? Which direction do the turbines spin in when the tides come in and out? Why do reactions have to he balanced? What part of the brain stem does sleep cycles come from? Do most tornadoes hit small outlying cities rather than big ones? Why are speech accents such as a southern drawl so regional and where did they come from in the first place? How chromosomes get ready for cell to split? Characteristic of tropical rainforest? Is it true or false that uranium nuclei split during nuclear fission? What are the three factors that can affect the rate of dissolving? What food does heterotroph eat?