What main concepts relate to race?

Electron 1 falls from energy level 4 to 1 and electron 2 falls from 3 to 2 which is more likely to emit red light? What are 2 things that you use falling water for? Example of declarative? What is the name of the tool that can pick up iron from sand? What happens when you freeze water and why is it strange? What kingdom do Escherichia coli belong? How many bushel are in a square yard? How can you make a homemade atom bomb? Which science process skill is an explanation of observation? When will the effects of global warming really affect us? What are the four kinds of sensors your skin has? 198g how many kg? How fast does hot water cool? Is upthrust a contact or non-contact force? Does the color of crayon affect it's melting rate? Is clorine reactive? What was the purpose of the gauze in the experiment using meat in a jar? What are shepherd moons? What are cononants? With regard to the object-lifting the IMA is equal to the?