It is associated with the production of eggs and preparing the uterus for the implantation of fertilised eggs. The menstrual cycle occurs over a period of about 28 days. The changes during the cycle are due to four hormones, progesterone, oestrogen, FSH (follicle stimulating hormone) and LH (luteinising hormone).
Examples include wood and paper. Combustible liquids have a flashpoint at or above 100 degrees F but below 200 degrees F. This definition does not include mixtures containing one or more components with a flashpoint at or above 200 degrees F. This group of liquids can also be identified by class.
However, with the almost limitless number of chemicals developed for home and industry, many products fall into other subcategories. For example, hydrogen peroxide, a common household chemical, is an oxidizer. It is important to identify the physical hazards products present and understand them. Because of our familiarity with fire, the physical hazards of combustible liquids and flammables are easiest to address. With few exceptions, a combustible liquid has a flashpoint at or above 100 F, but below 200 F. Flammables are divided into three categories by physical state (gas, liquid and solid).