effect of light on gene action
The hormones that stop your period are estrogen and progesterone. Estrogen causes bloating, mood swings and headaches while progesterone causes acne, fatigue and tender breasts.
It is a tree that loses its leaves in the fall. : )
If the temperature stays above 80 degrees Fahrenheit for a long period of time without rain, the Japanese Red Maple leaves will wilt.
Your period doesn't stop when you take a shower. Your menstrual flow isn't constant and what little blood leaves the body will be washed away by the water, thus may be less noticable.
Certain animals can put their bodies into a state of reduced metabolic state. Lower body temperature, heart rate and breathing. They then fall asleep until a specified period of time passes.
Reduced voltage levels of AC power that lasts for a period of time is known as a brownout.
The period of reduced activity is often referred to as a lull. This term describes a temporary decrease in activity or a quiet period in a particular situation or context.
a recession or depression
See the related link on what causes brown discharge after period.
a recession or depression
It causes menstruation (aka period). ~Karen~
The Roman Empire's fall left Europe vunerable to the savage attacks of the Vikings and the tribes from the east. Christianity took over for some time, and then the Barbarian tribes from the east came into the west and moved the people further west-ward. After some time, the Vikings came down from the North and first attacked Lindisfarne and then the rest of the monastaries or what not. This era is called the Medieval Era and it goes on for hundreds of years.
If the period is increased, the centripetal force needed to keep the object moving in a circular path will decrease because the velocity of the object is lower for a longer period. The centripetal force is inversely proportional to the square of the period.
drought drought
hibernation
Any number of causes. Food and the start of a period.
Essential means we don't know what causes it. Period!