A decline in the rates of sexual activity for teenagers between 1991 and 2001 was followed by a slight increase in reported sexual activity. With what did this slight increase in sexual activity positively correlate?
a. increase in federal support of abstinence-only education
b. increase in federal support of comprehensive sexual education
c. decrease in number of teenagers taking purity pledges
d. increase in number of teenagers taking purity pledges
Question 2
Why is it thought that teenagers who had taken a virginity pledge were less likely to use a condom than those who had not taken the pledge?
a. Using a condom would show that the decision to have sex was impulsive.
b. Condom availability is most likely limited in regions of the county where virginity pledges are most common.
c. Pledgers may be less educated in the necessities of condom use.
d. Teenage girls who pledge are also more likely to want to get pregnant at a young age.
The nitrogen cycle. Numbers represent fluxes as 1012 g N per year (data from Schlesinger 1991, after
Stellar Birth Rates
Summary of Cytokine Activity
Protein topology and folding rates
Physical Activity Pyramid
Staying hydrated during physical activity