Political unrest
* can cause rapid migrations of large numbers of people to new geographic areas.
* is another reason that people migrate.

Phenotypic plasticity
* can facilitate adaptive evolution in gene regulatory circuits
  - potentiate rapid evolutionary change
* common feature of organisms living in changing or variable environments.
* is hypothesized to be an adaptation to variable environments.

Pepsinogen
* is activated by the removal of a small fragment.
* is an enzyme
  - in the stomach responsible for the formation of pepsin
  - that starts protein digestion
  - converted to the active protein digesting form, pepsin
  - produced in cells that line the gastric pits
  - secreted by the chief cells
  - the enzyme in the stomach that hydrolyzes proteins

Patronymic
* are an old and common type of byname in most period European cultures
  - common in almost all European cultures
  - names
* is the custom of assigning last names based on the first name of the person's father
  - oldest type of Western surnames and is found in almost all European countries

Pure consciousness
* is just the simplest form of our own awareness, located at the source of thought
  - our spiritual essence
* is the fundamental level of awareness, the basis of all thinking and behavior
  - source of the unlimited creativity and intelligence of the mind

Pseudopodia
* are false feet which use the same contractile proteins that are in muscles.
* can occur as multiple rounded or needlelike projections or as a single advancing front.
* extend from the cell surface and later detach to form the blood platelets.
* radiate from the central body.

Peachick
* Most peachicks can fly within days of birth.
* stay Juvenile until they'r three years old and can mate.

Prokaryotic flagella
* differ structurally from their eukaryotic counterparts.
* spin like propellers, whereas eukaryotic flagella move with a whiplike motion.

Pulmonary emboli
* are a major cause of death following operation.
* can be life threatening or fatal in some circumstances
  - very dangerous

Psychological counseling
* is the cornerstone of treatment for eating disorders.
* religious wolf in pseudoscientific clothing.

Protective headgear
* decreases the chances of brain or spinal cord injury.
* is for all riders, although especially important for jumping and racing.

Physical presence
* is an important dimension of communication and intimacy
  - the actual place where a person lives
* means that gaming events become social events.

Parke
* has a dry climate.
* is on the main Australian transcontinental railway line between Sydney and Perth.
+ Parkes, New South Wales, Geography
  * Parkes has a dry climate. The winter temperatures are rarely lower than 0 degrees Celsius during the night. In summer daytime temperatures can be as high as 40 to 45 degrees Celsius. Temperatures in the low to mid-30s are most common
  - Wales: Towns in New South Wales
  * Parkes' is a city in New South Wales, Australia. In 2006 there were 9,826 people living in Parkes. It is the centre and main city of the Local Government Area of Parkes Shire. Parkes is on the main Australian transcontinental railway line between Sydney and Perth. The Newell Highway between Victoria and Queensland goes through the city

Parental control
* help parents keep tabs on the in-line images.
* is lost at the age of majority.

Psychological change
* accompany aerobic exercise in healthy middle-aged adults.
* can be part of menopause
  - happen simply and rapidly

Pure corundum
* colorless, trigonal crystal with a hardness between that of emerald and diamond.
* is colorless.