The andromeda galaxy is located approximate 2.5 million light-years from earth. why is the light that reaches earth 2.5 million years old

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Fossil fuels are organic compounds that are made from

Select the correct answer from each drop-down menu. to make a table of the elements, dmitri mendeleev sorted the elements according to their . he then split the list of elements into several columns so that elements beside each other had similar .