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.
Meat was a source of food and animal hide was used to make clothes. They lived in clans of 20-30 people in caves, outdoors or in cabins made of tree branches and animal skin. The Neolithic era began when humans discovered agriculture and raising cattle, which allowed them to no longer have a nomadic life style.