What made you want to look up negative valence? Please tell us where you read or heard it (including the quote, if possible).
WBS is nothing but Work Breakdown Structure. It is mainly used in Project System (PS) module. Tcode: CJ20N. For any project defined we must have atleast one WBS. Within this WBS we can have networks. Networks are nothing but the series of activities. Material are used to perform the activities.
Stress Tablet W/Zinc oral Uses. This medication is a multivitamin product used to treat or prevent vitamin deficiency due to poor diet, certain illnesses, or during pregnancy. Vitamins are important building blocks of the body and help keep you in good health.