### beginning | cause | factor:

Homeotic gene
* act as switches at the level of transcription.
* appear to be similar among all animals.
* are genes that control other genes
  - special genes which control the formation of whole organisms or body parts
  - thus on a high hierarchical level
* control the general architecture plan of the embryo of higher eukaryotes.
* define the functional characteristics of the segments.
* determine segment morphology.
* direct the identity of body parts.
* regulate embryonic development by coding for transcription factors.

### beginning | cause | factor | homeotic gene:

Homeobox gene
* act as master developmental regulators in specifying cellular identities.
* are genes that regulate the activity of other genes
  - important for the proper patterning of the mammalian telencephalon
* control the general shape of the fetal body.
* homeotic gene
* recognize more or less the same consensus DNA sequence.

Hormonal factor
* are very important in the development of breast cancer.
* play a role.

### beginning | cause | factor:

Human factor
* Many human factors are important in the purchasing of services.
* More human factors can cause one person to be selected over another.
* Some human factors lead to degradations.
* are critical to maintaining safety
  - mistakes or errors of judgment made by people
  - more important than all the technology in the world
* cause effects.
* explain the increased losses from weather and climate extremes.
* is an area where applying the systems perspective to engineering is key
  - concerned with improving performance, efficiency, safety, and comfort
* is the applied science which studies people working together in concert with machines
  - science of designing systems that are safe, comfortable, effective, and usable
* new way of thinking about workplace safety.
* play a role as important as the electronic and mechanical design of the system
  - significant roles in more accidents than do mechanical failures

Hygiene factor
* are factors that eliminated dissatisfaction.
* refer to pay and work conditions - including the package and the firm's culture.
* relate to our biological needs, such as providing food, clothing, and shelter.

Important environmental factor
* influence distribution
  - size
* limit plant productivity

### beginning | cause | factor:

Important factor
* Most important factors affect atmospheres
  - diet compositions
  - influence human health
* Most important factors regulate earth sun energy
* Some important factors affect abundances
  - calcium absorption
  - deep sea life
  - ecology
  - mortality
  - plant growth
  - reproduction
  - reproductive output
* Some important factors associate with atherosclerosis
  - early atherosclerosis
* Some important factors contribute to numbers
  - population growth
* Some important factors determine abundances
  - biodiversity
  - influencing the evolution of the atmosphere occur on a very small scale
  - communities
  - quality
  - strength
  - water quality
* contribute to burdens
  - differences
  - the development of streptococcal pyodermas or ecthyma
* control responses.
* determine depth
  - functional outcomes
  - success
* govern development.
* include adults.
* influence development
  - distribution
  - kidney stone development
  - mountain permafrost distribution
  - survival
  - winter mortality
* threaten survival.

Internal factor
* Some internal factors are caused by yeast.
* are growth regulators, enzymes, and water
  - inheritance, race, obesity, ageing, and immune and neuro-endocrine status
* influencing cholesterol levels are usually hereditary and beyond our control.