The follicular phase begins with an increase in follicle-stimulation hormone (FSH), which causes increases in luteinizing hormone (LH) and gonadotropin-releasing hormone (GnRH). Concurrent increases in estrogen levels cause increases in progesterone, stimulating proliferation of the endometrium.
Examples of insulators include plastics, Styrofoam, paper, rubber, glass and dry air. The division of materials into the categories of conductors and insulators is a somewhat artificial division. It is more appropriate to think of materials as being placed somewhere along a continuum.
All of the products in the line (toilet paper, paper towels, facial tissue, napkins, etc) are made from 100% recycled material and contain a high percentage of post-consumer recycled content. 2009: August â Cuba declares it may run out of toilet paper by the yearâs end.