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Total fertility rates (TFRs) among major regions of the world.
Environmental factors restricting the distribution of Chthamalus to the upper intertidal zone.
Marine Worm Under An Electron Microscope
The primary windings are inside the secondary windings on this General Motors coil.
Primary rainbows are the brightest and most common.
Lobes of the brain, with primary receiving and integrating centers of the human cerebral cortex.