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.
4.08 What Makes A Good Conductor? 1. The aluminum foil, steel wool, paper clip, copper, charcoal stick, and graphite pencil weregood conductors and displayed metallic properties. The glass rod, MylarÂ®, plastic, rubber, andwood were poor conductors.2. Most of the samples with metallic properties contained metallic bonds. The exception was car-bon.3.