### beginning | cause | factor:

Neurotrophic factor
* are essential for the growth, maturation and survival of nerve cells
  - to the development of nociceptors during embryogenesis
  - like nannies to brain cells
  - messengers in the communication between neurons
* are proteins essential for nervous system development and function
  - which function to regulate survival of neurons
* have the ability to stimulate nerve growth and regeneration.
* increase neuregulin expression in embryonic ventral spinal cord neurons.
* seem to protect nerve cells from damage under a number of conditions.

Nonliving factor
* are called abiotic factors.
* determine what living things can be supported in an ecosystem.

Numerous factor
* Most numerous factors govern population growth.
* Some numerous factors affect hair growth
  - numbers
* govern growth
* increase a child's risk of hearing loss.
* influence behavior
* influence the ability to smell
  - interactions among intestinal micro-organisms and their hosts
* involving either physical or emotional stress can cause menstrual irregularities.
* make pregnant and postpartum women more susceptible to thrombosis.

Nutritional factor
* are among the most important influences on primate food choice.
* can influence drug effects.
* play a certain role in prostate health.

Occupational factor
* are responsible for a significant amount of morbidity.
* can exaggerate or add to existing illness.
* play also an important role in the development of ganglions.

Other environmental factor
* affect blood pressure
* cause variation.
* have effects.

### beginning | cause | factor:

Other factor
* affect ages
  - capacity
  - communities
  - decisions
  - distribution
  - hedgehogs
  - outcomes
  - phytoplankton communities
  - quality
  - results
  - status
  - voltage
* associate with consumption
  - vegetable consumption
* can have effects
  - impact
  - positive effects
* cause incidents
  - variation
* contribute to specialization.
* control reaction.
* determine ages
  - responses
* have consequences
  - negative consequences
* have significant consequences
* impact breathe techniques.
* impact proper breathe techniques
* include attributes
  - development
  - diseases
  - environmental conditions
  - oral diseases
  - presence
  - roles
  - water
* influence choices
  - extent
  - global temperature
  - metamorphosis
  - success
  - weight
* interfere with functions
  - normal functions
* make differences
  - huge differences
* may have effects

Other such factor
* influence results.
* may have effects.

Physical factor
* affect distribution.
* can determine the range of a species
  - directly affect a man's ability to get and maintain an erection
* increase the risk of violence as well.
* influence distribution

Physiological factor
* Some physiological factors affect fermentation reaction
  - photosynthesis
* Some physiological factors alter calcium metabolism
  - determine roles
  - regulate development
* affect the appestat, too.
* cause stress as well.
* lead women.

Power factor
* is the ratio of active power to the product of rms voltage and rms current
  - true power or watts to apparent power or volt amps
* measure of the efficiency with which input power is converted to useful work.

Predictive factor
* are measures associated with the response to a specific therapy.
* can help to personalize cancer pain management.

Primary factor
* Some primary factors affect photosynthesis.
* Some primary factors limit human growth
* contribute to occurrences.
* determine presence.