Exoskeleton is the outer protective coat for some animals and  mammals. Advantages of exoskeleton include the safety to animal,  and ability to live on a variety of surfaces â¦ .The disadvantage  includes the restriction of growth and size.xoskeleton is the outer protective coat for some animals and  mammals. Advantages of exoskeleton include the safety to animal,  and ability to live on a variety of surfaces â¦ .
1 Volatile oils that dry out are generally more harmful to your health. 2  Mineral oil does not give off harmful vapour. 3  Water is used as a cutting fluid in some stones, but it dries even over short sessions, does not seem to lift filings as well as mineral oil, and remains on the tool after honing.
The most commonly used oil for aromatherapy is eucalyptus globulus, with a strong, camphor-like scent. Others have basically the same traits but are slightly more gentle and include eucalyptus radiata, eucalyptus smithii and eucalyptus citriodora. Whichever species you have or can find, eucalyptus essential oil has especially powerful germicidal properties. For example, place a two percent mixture in an aroma burner to kill 70 percent of staphylococcus bacteria in a room.