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 positive effects of agriculture. The results of the Neolithic Revolution were striking. On the positive side, a farmer was able to grow more food than he needed to feed his family, so for the first time in human history we saw specialization. Agricultural societies were able to support leaders, artists, craftsmen, priests, scribes, and soldiers, none of whom had to worry much about where their food came from.