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 of Wound Tunneling. 1  Tunneling of a wound may occur for various reasons: 2  infection- results in destruction of tissue. 3  too little/too much packing- using too much packing can degrade newly granulated tissue, while using too little packing may not absorb drainage adequately and may increase the risk of abscess formation.