### covering | mask:

African mask
* Many African masks represent animals.
* do come in a variety of shapes, styles and materials.

Dust mask
* are ineffective in protecting against herbicide vapors.
* can guard people with seasonal allergies against pollen and dust.
* can help prevent inhaling airborne allergens such as pollen and mold
  - or reduce the inhalation of small fiberglass particles
* filter out or trap minute airborne particles such as dust, chaff, and most molds.

Face mask
* are masks
  - more effective barriers than face shields
* have one large lens covering eyes and nose and are designed for underwater diving.

Facial mask
* Some facial masks have a grainy texture that helps smooth the skin during the rinse cycle.
* help in removing dead skin, unclogging pores and prevent premature lines and wrinkles.

Gas mask
* are usually full-facepiece respirators with one filtering canister.
* protect against inhalation.
* provide protection against pesticides, and often toxic erbium materials
  - the best facial protection, if properly fitted and sealed

### covering | mask:

Respirator
* Most respirators used in farming activities supply fresh oxygen.
* Some respirators supply air while others filter room air.
  * A 'respirator' kind of mask that is used to protect someone from breathing in dusts, fumes, or gases that might hurt them. Respirators come in many types and sizes. They are used by the military and industrial workers.
* are a recommended piece of equipment when waxing.
* can be either disposable or non-disposable
  - hazardous to people with heart and lung problems
  - keep the person apparently breathing forever
  - protect against some hazards in the air
  - provide protection from airborne contaminants that cause occupational diseases
* come in different sizes to accommodate different sized faces
  - various forms
* depend on exposure level.
* only protect from inhalation exposure.
* protect cleanup workers from inhaling airborne mold, mold spores, and dust
  - painters from toxic fumes
  - users from airborne hazards such as smoke, chemicals, lead, dust, and asbestos
* provide protection to the wearer from inhaling infectious droplet nuclei.
* work by using either a chemical or mechanical filtration system.

### covering | mask | respirator:

Respiratory acidosis
* can also result when obstruction of air motion leads to carbon dioxide buildup
  - be a consequence of bronchitis , asthma or airway obstruction
* is acidosis
  - caused by abnormally high levels of carbon dioxide in the body
  - often a consequence of diseases like emphysema
* symptom of several lung diseases.

Respiratory change
* associated with aging include three of the following.
* can occur in the form of periodic breathing or apnea.

Surgical mask
* Some surgical masks fit so poorly that they provide very little protection from any airborne hazard.
* are for doing surgery.
* protect the wearer from liquid droplets and fluid splatters.

Pall
* cause dies.
* large white cloth which covers a closed casket during the funeral service.

Perianth
* Some perianths are part of anemones
  - angiosperms
  - blossoms
  - bluebottles
  - buds
  - carnation
  - catkins
  - daisies
  - dicotyledons
  - florets
  - flowers
  - helianthuses
  - marigolds
  - monocots
  - orchids
  - poppies
  - snapdragons
  - snowdrops
  - sunflowers
  - vanillas
  - wildflowers
* includes petals
  - sections
  - sepals
* plant part.

Plumage
* Most plumages contain pigment.
* Most plumages look like juvenile plumages
  - show differences
* Some plumages change color.
* Some plumages cover heads
  - long tails
* Some plumages have aspects
  - bronze
  - degrees
  - white tails
* are bright mainly in irredescent or pigmented greens and blues.
* include feathers
  - grey feathers
* includes barbs
  - corpi
* ranges from mottled reds, grays to browns in color.