### process | decay:

Cavity
* All cavities are free of excess or abnormal fluid accumulation and adhesions.
* Cavities are a common problem among older adults
  - destruction of the tooth enamel
  - major concern among parents and children
  - common in areas of the breccia and are generally lined with quartz crystals
  - frequent, but hilar adenopathy is rare
  - limited and have most likely been used by other birds
* Cavities are located in dentists
  - molars
  - mouths
  - solid objects
  - teeth
  - tooths
  - negative space
  - part of bodies
  - really the first stage of the disease
  - spots
  - still the most prevalent chronic disease of childhood
  - structures
* Cavities are the decay, disintegration, and eventual destruction of a tooth
  - loss of the hydroxyapatite's crystalline latticework structure
  - number one cause of tooth loss
  - preferred nest sites
  - result of gas bubbles in the magma
  - uncommon in dogs
  - used for fill
* Cavities are usually brown and somewhat dry
  - dry and surrounded by apparently healthy tissue
  - in snags, which is the term for standing dead or dying trees
* Cavities can form and break through into the bronchi, releasing bacteria that can be coughed out
  - lead to root abscesses
  - take months, sometimes even years, to develop
  - contain nerves
  - draw air
  - fill with air
* Cavities form in the center of the stalks near the soil line
  - to define the amnion and yolk sac
  - formed by other natural processes also provide shelter
* Cavities have purposes
  - hurt when they get bigger and touch nerves
  - often form after flush cuts or stub cuts
* Cavities result from improper pruning i.e. from cutting flush with the trunk when removing branches
  - the interaction between normal mouth bacteria and carbohydrates in the diet
* Many cavity nesting birds depend upon dead, decaying trees for excavating cavities.
* Most cavities contain nerves
  - have structures
* Some cavities aid in respiration.
* Some cavities are caused by explosions
  - used by animals
* Some cavities become digestive tracts
  - proboscises
  - can easily accommodate thousands of cockroaches
  - cause sinkholes
* Some cavities collect urine
  - waste
* Some cavities contain compound organelles
  - hearts
  - many small seeds
  - marrow
  - create vacuums
* Some cavities fill with blood
  - liquids
  - form grooves
* Some cavities have diameters
  - duct glands
* Some cavities have large areas
  - surface areas
  - maximum diameters
  - hold water
  - move air
  - provide habitats
* Some cavities surround hearts
  - internal organs
* Some cavities use for excretion
* digestive sac with only a single opening.
* nesting species require a cavity in which to build their nest and lay eggs.

### process | decay | cavity:

Body cavity
* Body cavities have structures.
* Most body cavities have structures.
* Some body cavities collect waste.
* Some body cavities fill with blood
* Some body cavities help internal pressure
* Some body cavities surround hearts
* pseudocoel, body fluid under high pressure.

Cleavage cavity
* Cleavage cavities are part of blastocysts.
* Most cleavage cavities are part of blastocysts.

Hollow
* Some hollows fill with water.
* are the opposite of floating islands.
* is space
* provide habitats for many animals.

### process | decay | cavity | hollow:

Bird bone
* Most bird bones are hollow and filled with air from the bird's lungs.
* are hollow and therefore light
  - strong and hollow with inside supports
  - very light and filled with air
* weighs about half as much as mammal bone because the bird bone is hollow.

Mantle cavity
* Some mantle cavities aid in respiration
  - have areas
* Some mantle cavities have large areas
  - surface areas

Mouth cavity
* Some mouth cavities create vacuums.
* contains teeth, tongue and salivary glands.

Natural cavity
* Natural cavities result from damage to a tree caused by weather or disease.
* Some natural cavities hold water.