By adopting a sedentary way of life, the Neolithic groups increased their awareness of territoriality. During the 9600-6900 BCE period in the Near East, there were also innovations in arrowheads, yet no important changes in the animals hunted was detected.
3. Poor screen preparation is a major cause of pinholes. Particles of dirt, wood frame chips, and dust remaining on the fabric during coating will be trapped in the emulsion. Opaque, they will block light from hardening the emulsion beneath them, so that the emulsion in these small areas will wash away after exposure.
Causes: Once the blood clot becomes dislodged, there are many ways that dry sockets can develop. Both drinking from a straw and smoking can create suction that can cause the clot to become dislodged. The main cause of the development of dry sockets is food or other debris becoming lodged in the place of the blood clot. Food is hard to remove from an open socket without proper tools.