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.
Sweet alyssum is a long-blooming annual or short-lived perennial. Growing only about 4 to 6 inches tall, it hugs the ground forming a dense groundcover. Narrow leaves about one inch long hardly show through clusters of tiny flowers that cover the plants over a long season.