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.
Archaeological evidence indicates that by 7,000 B.C. Neolithic farmers had moved into Europe. They introduced their ideas and genes to Palaeolithic people, who had migrated into the continent 30,000 to 40,000 years before. The transportation methods and travel routes the Neolithic used have long been questioned.