Question 1.6 Choose the correct answer(s)The following graphs show the world population in millions from 1000 to 2010 and the world population growth rate in the 20th century. Based on this information, read the following statements and select the correct one(s).多项选择题
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Question 1.6 Choose the correct answer(s)The following graphs show the world population in millions from 1000 to 2010 and the world population growth rate in the 20th century. Based on this information, read the following statements and select the correct one(s).多项选择题

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BlackTom AI · Accepted Answer

From the first graph the world population is about 1 billion around 1800 and about 7 billion around 2000, so the numerical basis for the percentage change is clear.

1) Relevant knowledge points and concepts
- Percentage increase = (final − initial) / initial × 100%.
- Read graph values carefully (units: billions or millions). Here the graph’s labels show ~1 billion in 1800 and ~7 billion in 2000, a 200-year interval.
- Distinguish growth rate (percent/year) from population size.

2) Step‑by‑step reasoning
- Identify initial value (around 1800): P_initial ≈ 1 billion.
- Identify final value (around 2000): P_final ≈ 7 billion.
- Compute absolute change and then the percentage increase over the 200 years.

3) Calculations (all intermediate steps)
- Using billions: change = 7 − 1 = 6 billion.
- Percentage increase = (6 / 1) × 100% = 600%.
- Using millions (equivalent check): 1 billion = 1000 million, 7 billion = 7000 million. Change = 7000 − 1000 = 6000 million. Percentage = (6000 / 1000) × 100% = 600%.

4) Why the correct answer is correct
- The graphs give values ~1 billion (1800) and ~7 billion (2000). Plugging those into the percentage formula yields 600%, so statement c is quantitatively supported by the plotted data.

5) Why the other options are incorrect (brief)
- a. “The world population continues to grow at an increasing rate.” Incorrect: the lower panel (20th‑century growth rate) shows the annual growth rate peaked mid‑20th century (~1.9–2.0%) and then declines toward 2010, so the growth rate is not continuously increasing.
- b. “The world population did not grow much from 1000–1700…” Misleading/incorrect: while growth was slower than after 1700, the population still rose noticeably (roughly doubled from ~500–600 million to ~1 billion by 1700/1800), so saying it “did not grow much” is inaccurate even if the post‑1700 acceleration occurred.
- d. “The graphs suggest the world population will start shrinking in near‑term.” Incorrect: the growth rate is declining but remains positive in 2010 (the population is still increasing), and no near‑term decline (negative growth) is indicated.

6) Conclusion
The calculation (from ~1 billion to ~7 billion in ~200 years) gives a 600% increase, which confirms the provided correct answer: c. There has been a 600% increase in the world population over the past 200 years.

Question 1.6 Choose the correct answer(s)The following graphs show the world population in millions from 1000 to 2010 and the world population growth rate in the 20th century. Based on this information, read the following statements and select the correct one(s).多项选择题

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