Why did China shift from a One-child policy to a Two-child policy in 2015?
A. shrinking workforce
B. rising number of elderly citizens
C. reduction in family planning
D. reduction in availability of contraception
E. Both A and B are correct.
Answer: E. Both A and B are correct.
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Which of the following crosses lipid bilayers the slowest?
A) a sodium ion B) a small, polar molecule like water C) a large, polar molecule like glucose D) a small, nonpolar molecule like oxygen (O2)
When we compare levels of genetic variation in a contemporary African population to that of a contemporary non-African population, we find there is:
A. more variation in the African population. B. more variation in the non-African population. C. equal variation in both populations. D. no consistent pattern: sometimes we find more variation in the African population and sometimes we find more in the non-African population. E. None of the answer options are correct.
The dorsal blood vessel is the structure labeled __________ in Figure 31-6
A. 1
B. 2
C. 3
D. 5
E. 6
In a population characterized by type III survivorship, the probability of survival ____ with age
a. increases
b. decreases c. does not change d. first decreases then increases e. first increases then decreases