### activity | examination | study:

Numerous study
* Numerous studies confirm a key role for cholinergic nerve transmission in sexual responses
  - anti-platelet drugs are effective for high risk and moderate risk patients
* Numerous studies confirm that as people age, they want to remain in their home communities
  - fatherlessness contributes to child poverty
  - smoking causes premature aging and wrinkling of the face
  - the toxicity of different POPs to humans
  - describe girls' loss of self-esteem at adolescence
* Numerous studies document that the fetus is highly sensitive to hormones and hormone-like chemicals
  - the psychological benefits of sport and exercise
  - find fish eaters have less heart disease
* Numerous studies indicate that a healthy lifestyle improves one's overall quality of life
  - exercise decreases mild depression as effectively as psychotherapy
  - physical education is essential to children's health
* Numerous studies link excessive weight to high blood pressure
  - expectations for success and achievement-related behaviors
  - point to fruits and vegetables as anti-high blood pressure agents
* Numerous studies show a link between high fiber intake and decreased risk of colon cancer
  - to cancer
  - adolescents are the group most at risk to start smoking
  - folate is an important player in the prevention of birth defects in newborns
  - lower levels of vitamins and minerals in depressed people
* Numerous studies show that children who eat breakfast definitely perform better in school
  - fat in the hips and thighs is less health threatening than abdominal fat
* Numerous studies show that health insurance is highly tied to employment status
  - problems can be linked to poor nutrition
  - it causes cancer in lab animals
  - lead in any amount can be dangerous for children
  - simply consuming soy protein lowers cholesterol and blood pressure
  - staying active can help prevent heart disease
  - teachers often treat boys and girls differently
  - women are in worse financial shape than men in the United States
  - women achieving stronger roles and greater importance in the work force
  - suggest children of both sexes develop clear preferences for thin bodies
* Numerous studies suggest that A is toxic to neurons by free radical-mediated mechanisms
  - carotenes as a whole can reduce the risk of heart disease

Occupational study
* Occupational studies continue to provide the bulk of evidence of benzene's carcinogenicity.
* Some occupational studies report an increase in one type of cancer, some in another.

Population study
* Population studies are an important aspect of the study of ecology
  - involve the tracking of disease across large numbers of people
  - shed light on the impact of diet on cholesterol metabolism
  - show a strong relationship between cancer risk and fat intake
* investigates the change of species in time and space.

### activity | examination | study:

Previous study
* Many previous studies corroborate the role of androgens in enhancing sexual desire in women and men.
* Previous studies have shown learning can result in changes in brain activity.
* Previous studies indicate that feathers serve as the primary excretory pathway for organic mercury
  - our brain consists of a large number of repeating modules
* Previous studies show breast cancer patients who took tamoxifen reduced their risk of cardiac death
  - it helps pregnant women keep their blood vessels open to their fetuses
  - smoking lowers vitamin C levels in adults
  - suggest that coyotes are intolerant of foxes where their ranges overlap