About how long ago did the common ancestor between humans and chimpanzees exist

Which element forms the basis of all organic organisms a carbon b oxygen c hydrogen d nitrogen

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Suppose you use three different scale to weigh a bag of oranges. one scale says the nag weighs 2.1 lb, and third says it weighs 2.1 lb. the actual weight of the bag of oranges is 2.153 lb. which of the following best decribes these results?