What does a scientist plan and conduct to see the effects the independent variable has on the dependent variable?

A scientist plans an experiment with a factor that will be kept constant throughout the experiment and will check how the independent variable affects the dependent variable.

your answer is c) plasma

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chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. these processes are called chemical reactions and, in general, are not reversible except by further chemical reactions. some reactions produce heat and are called exothermic reactions and others may require heat to enable the reaction to occur, which are called endothermic reactions. understanding chemical changes is a major part of the science of chemistry.