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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

Gram-negative bacteria have a cell wall that is! and does not accept the stain, making itappear

24. how are vaccines used to keep people healthy?