Identify the main characteristerics of cells

Environmental differences within ecosystems are generally caused by

The first amino acid of a new polypeptide chain is

When new rock is added to an oceanic ridge, the magnetized strips on either side of the ridge are evidence of sea-floor spreading. this is because the rocks on the two sides of the ridge o are equal in width and in polarity are polar opposites oare magnetized vary in width but are equal in polarity