Reabsorbtion. Occuring more commonly within the nephron system than filtration, this is a form of active transport which takes the the useful substances for the body from the tubules and places them back into the blood filled capillaries.
Oleanders are shrubs, but they are _big_ shrubs. Most of the varieties in cultivation top out at 8 to 12 feet tall and about the same width. The wild form, and some of the older cultivars used for windbreaks top out at 20 x 20 feet.
General Size. Elderberry shrubs typically grow 5 to 12 feet tall, but some can soar to heights of 20 feet. These taller elderberry bushes often appear more like multistemmed trees in the garden. They are also rapid growers with a spread that's typically 6 to 12 feet across.