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 period from the beginning of agriculture to the widespread use of bronze about 2300 bce is called the Neolithic Period (New Stone Age). Agriculture had developed at an earlier date in the Middle East, and the relationship of Europe to that area and the mechanism of the introduction of agriculture have been variously explained.