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.
Oleander is an evergreen shrub that can have white, red, pink or purple flowers. It also goes by the name of rosebay. This plant is extremely toxic to humans, cattle, dogs, goats and sheep. Oleander contains quite a few poisons including oleandroside, nerioside and saponins.