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.
Mature Height/Spread. Serviceberry usually grows to between 10 and 25 feet tall and 10 to 15 feet wide. It can however reach upwards of 40 feet, but this is rare in the landscape. It has a narrow, upright, rounded crown of medium-textured foliage with irregular branching habits.