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.
The Kraft paper has stronger fibres than the test paper, hence itâs used mainly as an outside paper, not only giving the box more strength, but also giving it an overall better look. The Kraft paper is also much easier to print on, as the test paper being thinner absorbs the print more.