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.
The Neolithic (New Stone Age) was a period in the technological development of Homo sapiens that started at the end of the Ice Age, 10,000 years ago, and ended around the Mediterranean Sea and other areas about 5,500 years ago, when the Bronze Age started. It was the period when first human settlements appeared.