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Hormonal regulation of digestion rate in the stomach and small intestine.
Cambrian trilobite, with a shell made of calcium carbonate.
During drought years on the Galapagos, small, easily eaten seeds become rare, le
A small adult H. erectus from Olorgesailie, Kenya.
Because of immature visual-motor coordination, young children find it hard to throw and catch small ...
A uniform solid cylinder of radius R and a thin uniform spherical shell of radius R both roll ...