well, to start off, before you ovulate (or release an egg) your body (particularly below the waist and above the legs) builds up a thick layer of blood and tissue to support the egg if it is fertilized. That happens 2-3 weeks before your period. The egg sticks to the "build-up" and waits to be fertilized. If the fertilization happens than the egg stays and grow for 9 months and you have a well cooked baby. If the fertilization does not happen than you release the egg and the blood and tissue out through the vagina making your period. This period can last for 3-9 days. At first you may spot, but usually your flow is heavy than decreases over time.
after Jurrasic period it is the Cretaceous period
1st period -Formative Period 2nd period-International Period 3rd period -National Period 4th period -World Music Period
The period after the Devonian Period (416 to 359.2Ma) is the Carboniferous Period (359.2 to 299Ma).
There are many famous periods in Japanese History. * Edo Period * Meiji Period * Jomon Period * Yayoi Period * Kofun Period * Nara Period
The Silurian period followed the Ordovician period.
early period
The Ordovician period came after the Cambrian period.
The Federal period
shot
Oxygen's period on the periodic table is the second period.
Qualifying period, Probation period. Trial period.
1st period.