Ascientist is looking at a cell's membrane. she notices that the membrane is composed (primarily) of a certain type of macromolecule. these macromolecules are unique in that they are not composed of monomers, but instead resemble "hairpins" with fatty acid tails. this scientist is looking at

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