Mrs. Grayson asked her class to bring one object from home to complete the electric circuit that they built in class. Some of the items that students brought are listed below. • paper clip string fishing line • pencil • penny The only things that made the circuit's light bulb light were the paper clip-and the penny. Why is that?

the answer is alpha particles hope i you

answer: they produce more slow than unicellular organisms.

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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.