Yellow bone marrow is the tissue
in the central canal of bone that consists chiefly of fat cells. Yellow bone
marrow produces fat cells, cartilage, and bones. It acquires the yellow color
by carotenoids in the fat droplets and it arises from the conversion of the red
bone marrows which occurs with age.
Osmosis is the word your looking for. This answer can also be found on google. This text i found will explain osmosis. Osmosis is the spontaneous net movement of solvent molecules through a semi-permeable membrane into a region of higher solute concentration, in the direction that tends to equalize the solute concentrations on the two sides. ... Osmosis is a vital process in biological systems, as biological membranes are semipermeable.
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Heliotropism is the process that describes how a plant specifically tracks the sun's movement across the sky.