Â©2003 Why is there a decision to make about having mammograms to screen for breast cancer? A mammogram every two years to screen for breast cancer reduces the chance of dying from breast cancer among women aged 50 to 69 years. It is unclear if women aged 70 years and older get the same benefits. mammogram every two years to screen for breast cancer reduces the chance of dying from breast cancer among women aged 50 to 69 years. It is unclear if women aged 70 years and older get the same benefits.
Temperate grasslands are located north of the Tropic of Cancer (23.5 degrees North) and south of the Tropic of Capricorn (23.5 degrees South). The major temperate grasslands include the veldts of Africa, the pampas of South America, the steppes of Eurasia, and the plains of North America.
Temperatures in temperate grasslands vary according to the season. In winter, temperatures can plummet to well below 0 degrees Fahrenheit in some areas. In summer, temperatures can reach above 90 degrees Fahrenheit. Temperate grasslands receive low to moderate precipitation on average per year (20-35 inches).Most of this precipitation is in the form of snow in temperate grasslands of the northern hemisphere.emperate grasslands and savannas are two types of grassland biomes. Like savannas, temperate grasslands are areas of open grassland with very few trees. Temperate grasslands, however are located in colder climate regions and receive less precipitation on average than savannas.