### beginning | cause | factor:

Intrinsic factor
- proteins
* binds to cobalamin and forms a complex that is absorbable.
* is made by cells in the stomach
  - manufactured in the lining of the stomach
  - produced by cells within the stomach
+ Pernicious anemia: Diseases :: Blood
  * A special protein, called intrinsic factor, helps the body get vitamin B12 from food such as meat, poultry and dairy foods. Intrinsic factor is made by cells in the stomach. If there is not enough intrinsic factor, the small intestine is unable to get the vitamin B12. There are several causes of pernicious anemia. These include a weakened stomach lining or a problem with the body's immune system which causes it to attack the intrinsic factor. In some rare cases is can be passed down through families. Treatment is usually a regular injection of vitamin B12.

Key factor
* Most key factors influence reproductive output.
* Some key factors affect germination
  - life
* Some key factors involve in fat metabolism
* cause fluctuations.
* include attributes.
* influence life
* linked with increased suicide rates include feelings of isolation, and low self-esteem.
* promote differentiations.
* threaten survival.

Lifestyle factor
* Most lifestyle factors affect ages
  - women
  - contribute to differences
* can also cause increased risk of reflux
  - increase the risk and incidence of heartburn
* including diet and exercise can impact depression.

Limit factor
* Most limit factors regulate growth
  - phytoplankton growth
* Some limit factors affect photosynthesis.
* affect behavior
  - feed behavior
* cause exponential growth
  - fluctuations
* change over time.
* include temperature.

Limiting factor
* affect ecosystems.
* are a natural part of a healthy ecosystem
  - also responsible for the geography of plant distribution
  - things that prevent a population from growing any larger
* control populations of all living things.

Major environmental factor
* influence growth
* limit crop productivity

### beginning | cause | factor:

Major factor
* Most major factors determine male reproductive success
  - influence phytoplankton growth
* Most major factors regulate growth
* Some major factors affect deforestation
  - ecology evolution
  - excretion
  - livestock production
  - plant growth
  - reproduction
  - associate with diabetes
  - contribute to evolution
  - determine relative abundances
  - influence predators
  - limit otter abundances
  - threaten honey bee health
* affect diversity.
* associate with infection.
* control distribution.
* determine distribution
  - equilibrium
* influence growth
* lead to diversity
  - revolution
* limit crop productivity
* threaten survival.

### beginning | cause | factor:

Many factor
* Most many factors affect hedgehogs
  - moisture
  - soil moisture
  - weight
* Most many factors influence forest biodiversity
  - immune responses
* Some many factors affect corrosion
  - mite reproduction
  - taste
* Some many factors associate with diseases
  - good nutrition
* Some many factors contribute to mortality
  - numbers
  - osteoporosises
  - pregnancy
  - determine electricity
* Some many factors influence parasite load
  - population abundances
* affect compositions
  - decisions
  - quality
* can have effects
  - positive effects
* cause uncertainty.
* contribute to development
  - explosions
* determine values.
* influence biodiversity
  - completions
  - cost
  - situations
* require analyses.
* threaten survival.

Maternal factor
* Some maternal factors regulate development.
* account for the majority of second-trimester abortions.

Mental factor
* do affect pain, and especially litigation.
* play a greater role than they do in other events.

Mortality factor
* include diseases.
* limit numbers.