CHOOSE THE BEST ANSWER Three countries have all reduced thei…

CHOOSE THE BEST ANSWER Three countries have all reduced their fertility rates to at or under replacement (2 children per woman). However, their population age structures differ: Country A: Has a very large proportion of people under age 20. Country B: Has a mostly middle-aged and older population, with few young people. Country C: Has a balanced distribution across all age groups. Which country is most likely to experience continued population growth due to population momentum?

CHOOSE THE BEST ANSWERS Over the last 500 years, 34 amphibia…

CHOOSE THE BEST ANSWERS Over the last 500 years, 34 amphibian species have gone extinct out of 6,400 known amphibian species. The background extinction rate is the rate at which species go extinct during the interludes between mass extinction events. On average, the background extinction rate for amphibians is 2 extinctions per 10,000 species per 100 years. Based on the background extinction rate, how many amphibians would be expected to have gone extinct over the last 500 years? [Expected] How does the observed number of extinctions compare to the expected number of extinctions? [Observed]