If you know that you are not pregnant, how long is too long before you should be alarmed if you don't have your period? What could be the possible reasons for a delayed period?
WEATHER: The tundra is the coldest and the driest of all the biomes on Earth. There is very little rainfall in the tundra; it rains less than ten inches a year. Winters here are long, and summers short, sometimes they last for only 6 - 10 weeks. In the winter the temperature can reach -50Â°F (-45.5Â°C).
Aside from a few small isolated patches, tundra is confined to a belt of land that runs along the northern edge of the European and North American continents. These are some of the coldest areas on Earth, as the tundra is the coldest of the five major biomes. One of the defining features of the tundra is an almost complete lack of trees, as it is generally too cold and dry for them to grow. Plants on the tundra are limited to small shrubs, flowers and grasses that can endure the short growing season.