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 people in the Nile Valley likely came from Sudan, as well as the Sahara, and there was shared culture with the two areas and with that of Egypt during this time period. By the 5th millennium BC, the people who inhabited what is now called Nubia participated in the Neolithic revolution.he Neolithic people in the Nile Valley likely came from Sudan, as well as the Sahara, and there was shared culture with the two areas and with that of Egypt during this time period. By the 5th millennium BC, the people who inhabited what is now called Nubia participated in the Neolithic revolution.