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watchOS is the mobile operating system of the Apple Watch, developed by Apple Inc. It is based on the iOS operating system and has many similar features.

It was released on April 24, 2015, along with the Apple Watch, the only device that runs watchOS.

Its API is called WatchKit.

iOS (formerly iPhone OS) is a mobile operating system created and developed by Apple Inc. exclusively for its hardware.

It is the operating system that presently powers many of the company's mobile devices, including the iPhone, iPad, and iPod Touch.

It is the second most popular mobile operating system globally after Android.

iPad tablets are also the second most popular, by sales, against Android since 2013.

The menstrual cycle is the regular natural change that occurs in the female reproductive system (specifically the uterus and ovaries) that makes pregnancy possible.

The cycle is required for the production of ovocytes, and for the preparation of the uterus for pregnancy.

Up to 80% of women report having some symptoms during the one to two weeks prior to menstruation.

Common symptoms include acne, tender breasts, bloating, feeling tired, irritability and mood changes.

These symptoms interfere with normal life and therefore qualify as premenstrual syndrome in 20 to 30% of women.

In 3 to 8%, they are severe.

Android is a mobile operating system developed by Google, based on the Linux kernel and designed primarily for touchscreen mobile devices such as smartphones and tablets.

Android's user interface is mainly based on direct manipulation, using touch gestures that loosely correspond to real-world actions, such as swiping, tapping and pinching, to manipulate on-screen objects, along with a virtual keyboard for text input.

In addition to touchscreen devices, Google has further developed Android TV for televisions, Android Auto for cars, and Android Wear for wrist watches, each with a specialized user interface.

Variants of Android are also used on notebooks, game consoles, digital cameras, and other electronics.

Ovulation is the release of egg from the ovaries.

In humans, this event occurs when the de Graaf's follicles rupture and release the secondary oocyte ovarian cells.

After ovulation, during the luteal phase, the egg will be available to be fertilized by sperm.

In addition, the uterine lining (endometrium) is thickened to be able to receive a fertilized egg.

If no conception occurs, the uterine lining as well as blood will be shed during menstruation.