Peter challenges christians to grow to maturity.
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Ifound the exercise on the internet. attached is the list mentioned above.in order for a compound to be considered optically active it can't have any axis or plan of symmetry. the molecule  shouldn't also  be superimposable on its mirror image.with such considerations, the compounds that are optically active are: -third compound on the first image is optically active; -second and third compound from the second image are optically actives.

Answer/// the transcontinental railroad wasn't completed until four years after the civil war ended, it wouldn't have made much of a difference if it was completed before the war as it only ran east to west not north and south,   the first battle between iron-clad ships took place during the civil war (1862) it made wooden naval ships obsolete. the gatling gun was invented during the civil war , it was the forerunner of modern machine guns;