Composition
* Is the organization of elements or the arrangement of form in a work of art.
* Most compositions contain oxygen.
* Most compositions have lower average molecular weight
* Some compositions consist of proteins.
* are creations
  - essays
  - mixture
  - placements
* can refer to the area of a sheet in which the design appears in a drawing or print.
* change over periods
  - time
  - pigment
* counts trinucleotides from any set of sequences.
* craft that requires practice.
* have average weight
  - details
  - more details
  - titles
* includes sections.
* involves both sides of the brain at the same time.
* is altered by the harvesting, drying process, and storage of plant material.
* is an occupation demanding the highest levels of skill
  - operation on relations that yields a new relation
  - how the elements of a work of art are arranged
  - important in the classification of the non-foliated metamorphic rocks
  - organization or arrangement of form in a work of art
* is the arrangement or form of the piece
  - construction of a system from a set of primitive components
  - key technique by which systems of software components are constructed
  - make up of art, arrangment
  - pedagogy of written discourse
* is the way that forms are arranged in a work so as to create depth or distance
  - the elements that make up a picture are arranged
* is, in short, an application of a composer's theories about music.
* plays an even greater role in determining a magma's viscosity.
* possess antimicrobial properties
* refers to the actual species of organisms that comprise and ecosystem
  - mineralogy of the particles making up the rock, and of the cement
  - process of setting type
  - proportionate quantity of lean pork or muscle in a carcass
* refers to the way the parts of an image are arranged or planned
  - shapes, lines, and colors are combined in the painting
* support theories.
* varies among types of animals and has been quantified for human, nonhuman, and dairy.
+ Category theory: Mathematics
  * Composition is a way to make a new arrow out of two arrows. If two arrows form an elbow shape, then they have a composition arrow from the start of the first to the end of the second. Composition obeys some axioms, or equations.

### composition:

Body composition
* better expression of fitness than body weight alone.
* can change due to treatment, control of dietary energy intake and tube-feeding.
* changes due to fat deposits in the trunk
  - in women
  - with age
* consists of lean body mass and body fat.
* does affect energy use.
* is another important component of fitness
  - determined by measuring body fat
  - often part of the perception of optimal exercise performance
* is one component of fitness that greatly influences health
  - measure of a person's overall physical fitness
* is the body's proportion of fat and muscle mass
  - difference between fat mass and lean mass
  - fat in the body versus the nonfat in the body
  - ratio of lean body mass to fat body mass
* key factor in overall fitness.
* varies by age, selected general health factors, genetics, and status of training.

Chemical composition
* differs among the species of aloe.
* is highly variable from outcrop to outcrop and within outcrops
  - indicated by color
  - much like that of pyroxene
  - the most widely used basis for classification
* varies from cell to cell and species to species

Gas composition
* Some gas compositions have effects
  - indirect effects
* is detected by matched thermal conductivity cells
  - determined by the method of partial pressures
  - monitored continuously using an on-line gas chromatograph
* varies with sludge characteristics.