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.
The fruit is a drupe. Leaves of Olea contain Tricho sclereids. For humans, the most important species is by far the Olive (Olea europaea), native to the Mediterranean region. O. paniculata is a larger tree, attaining a height of 15â18 m in the forests of Queensland, and yielding a hard and tough timber.