### system:

Root system
* are essential parts of a plant
  - made of vectors
  - one of the 'mouths' of the tree
  - small, dark brown or black, and rotted
* are the 'anchors' of the tree
  - 'cellars' of the tree
  - usually broad and shallow, and rainwater is soaked up quickly
  - vital to the health and longevity of trees
* can also forge their way through the soil more easily.
* consist of a main or primary root, rootlets or secondary roots, and root hairs.
* develop to provide drought-resistance and hardiness.
* have a potential to degrade the levee
  - the ability to react to the heterogeneity
* help stabilize riverbanks, reducing erosion and water quality problems
  - soils and thereby reduce the risk of erosion
* is the portion of a plant below the surface of the soil.
* provide a large surface area for mineral ion and water uptake from the soil.
* survive most fires and sprout rapidly after fire.
* vary according to plant type.
* weakened by weevils are then more susceptible to winter injury and disease infection.

Satellite system
* All satellite systems seem to orbit near the equatorial plane of their parent planet.
* Some satellite systems receive information from space-based satellites in stationary orbit.

### system:

Scaffolding
* are systems.
* familiar concept in early childhood.
* happens when a teacher is helping a child.
* is intended to increase the precision of retrieved items
  - studied by many researchers
  - therefore an important characteristic of constructivist learning and teaching
  - tied to building facades, rather than being self supported from the ground
+ Child development, Child Development Theories, Sociocultural Theory
  * When the helper works with the child social interactions occur. Intersubjectivity happens when two people start with different understandings. The two people interact with each other. By interacting, the two people get to the same understanding. Scaffolding happens when a teacher is helping a child. The teacher will help more if the child needs it. The teacher will also help less if the child does not need help. Over time, the teacher lets the child work alone. When the child works alone her or she puts the conversation into his or her private speech. The private peech is then used to help the child do the problem.

### system:

Septic system
* Most septic systems are below ground and fed by gravity
  - use a two-step process to treat human wastes
* are a common method of wastewater disposal
  - common in rural areas
  - generally out of sight, out of mind
  - often unstable and leak-prone
  - one source of nutrient pollution of Maryland water systems
  - physical systems
  - potential sources of bacterial contamination
  - understandably fragile because they use soils
* can be a very reliable and cost effective way of sewage disposal
  - have a direct impact on lakes too
  - only partially treat chemical wastes
* collect and treat wastewater from homes or businesses.
* continue to be widely used in dispersed development.
* do require some water to flush toilets and to process waste.
* handle sewage.
* receive household sewage.
* work with bacteria, which are naturally present in human waste.

Several system
* are known to orbit a common centre of mass and are known as binary companions.
* exist in the body to detoxify chemicals, notably the liver enzyme systems.
* interact to limit damage to surrounding tissue.

### system | skeletal system:

Physical conditioning
* appears to lessen the vascular stiffening associated with aging.
* can tone respiratory muscles and slow the respiratory rate.
* helps vitality.
* is important, but so is mental conditioning
  - integral to the safe and efficient performance of a very demanding job
  - seen as an important component of staying competitive
  - the best way to avoid or lessen the degree of sprains
* key to preventing ankle injuries.
+ Sprain, Prevention: Skeletal system