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.
These tools were used in hunting and fishing. In the Neolithic age, when people started agriculture, they used tools made up of copper. The prime innovation of this age was the development of pottery. The development of pottery products made it easier to cook and transport food. People of the Paleolithic age had a simple technology. Gathering of food was their main objective. However, the people of the Neolithic age had a far developed and much more complex culture. They were farmers; they used to grow crops. These people had developed trade networks and made use of the barter system. They developed the basics of economy.