Menstruation? Idk if that is right, but it sounds like someone started their period.
If you are active then your fitness scores may turn out to be higher because you may have great endurance etc. when it comes to sports its important to know rules and guidelines. if you know that you are sure to pass the test
Answer:
All cells have an outer plasma membrane that regulates not only what enters the cell, but also how much of any given substance comes in. Unlike prokaryotes, eukaryotic cells also possess internal membranes that encase their organelles and control the exchange of essential cell components.
