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Suppose a,b, and c form an arithmetic sequence. Prove that b^2+bc+c^2, c^2+ca+a^2, a^2+ab+b^2 also form an arithmetic sequence.? Why is it difficult for animals of one population (living in the same are) to become different species from one another? Receptor co-localization? Why is beryllium blue on the periodic table? Find the electric intensity midway between the charges 1.67*10-7 coulomb and 1.67*10-7 separated by the distance of 60 cm .?