perimenopause

a. is marked by limited changes in reproductive hormones

b. occurs five to eight years after the final menstruation

c. is the period after a woman's last menstruation

d. is the period from a woman's first irregular cycles to her last menstruation

e. is marked by only trivial symptoms

Each pair of clay balls represents two planetesimals. if each planetesimal is composed of the same material and is separated he the same distance, which pair experiences the frayed gravitational attraction?

1. emigration the movement of people from one place to another 2. immigration a situation in which resources are being used up at a faster rate than they can be replenished 3. migration the leaving of one's homeland to settle in a new place 4. overpopulation the movement of people to a new country 5. sustainable development a situation in which the birth rate is not sufficient to replace the existing population 6. underpopulation the ability to meet current needs without reducing the ability to meet future needs 7. unsustainable development the increase in the population of a city 8. urbanization a situation in which the number of people exceeds the available natural resources in an area

Most of the carbon on earth is stored in the form of