In-facepiece dust concentration is changed dozens of times in a matter of minutes due to changes of the size of the gaps between the mask and face. Source. A respirator is a device designed to protect the wearer from inhaling particulate matter, including airborne microrganisms, fumes, vapors, i.e. gases.
Why join Brainly? A community for students. Products of the neolithic culture Steel plows Boats with sails Domesticated dogs Wild figs. the answer would mostly likely be referring to things that actually were of use to the neolithic people and agriculture was the biggest thing making the answer steel plow. anonymous.
Unlike the Paleolithic, when more than one human species existed, only one human species (Homo sapiens sapiens) reached the Neolithic. The term Neolithic derives from the Greek Î½ÎµÎ¿Î»Î¹Î¸Î¹ÎºÏÏ, neolithikos, from Î½Î­Î¿Ï neos, new + Î»Î¯Î¸Î¿Ï lithos, stone, literally meaning New Stone Age. The term was invented by Sir John Lubbock in 1865 as a refinement of the three-age system.