The human footprint in Mexico
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The human footprint in Mexico
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[post_date] => 2025-01-07 01:35:40
[post_date_gmt] => 2025-01-07 06:35:40
[post_content] => Practice Passage (Question 1-6)
*This passage is the property of Khan Academy and has been reformatted into an AAMC-style interface in their entirety by MedLife Mastery. MedLife Mastery does not endorse and is not an affiliate of Khan Academy.
Ecological patterns and processes are influenced by human activities in two main ways: directly, by the transformation of land into infrastructure and productive areas, or indirectly, through the byproducts of human activities that might disperse away from their causal source and degrade ecosystem functions. Direct modifications of the land through human infrastructure (human settlements, transportation pathways, and power lines) and productive areas (agriculture, aquaculture, forestry, and cattle ranching) have increased globally during the last century as a result of accelerated human population growth.
Several studies have analyzed the patterns of direct human modification of the land surface as a proxy measure of human influence on natural ecosystems. Although human modification indices do not convey the entire human effect expressed as changes historically accumulated over natural ecosystems, they are useful to infer the spatial pattern and extent of the capacity of humans to transform the earth through land use. Many studies analyze how diverse ecological regions have different capacity to respond to landscape transformations, but only a few of them analyze how the physical geography (defined, for example, as biomes or ecoregions) affects the spatial patterns of human modification.
Mexico is an ecologically heterogeneous country that hosts a diverse array of ecosystems ranging from hyper-arid deserts to tropical rainforests, which have evolved as a consequence of the country’s complex topography. Mexico is also one of the biologically megadiverse countries of the world, with high endemism for birds, mammals, and reptiles. In principle, it would be expected that human developments and land transformations in Mexico follow the country’s complex environmental mosaic, with regions where environmental conditions are more favorable for human settlement and occupation (given a particular level of technological development) showing a larger human footprint.
But land settlements and landscape transformations are not only the result of physical geography; there are also technological and historical components. The historic dimension is especially relevant in countries such as Mexico, with a long history of human occupation and well-documented civilization collapses. Indeed, despite the common misperception that Europeans found a New World that was largely unoccupied and wild, what Spaniards found in Mexico was a densely populated territory with well-developed agricultural settlements and large urban centers that heavily impacted their respective hinterlands. When Europeans arrived in Mesoamerica the population of the larger territory of what we now call Mexico was in the order of tens of millions of people. Although the native population was devastated by European diseases, the encomienda system, and 16th Century droughts, its geographical distribution at the time of Spanish conquest conditioned the subsequent land occupation and landscape transformations.
The ability of humans to transform the face of the earth has been referred to as the ¨human footprint.¨ The Human Footprint Index (HF) is calculated by adding all major large-scale anthropogenic transformations over the land surface. It uses four variables to summarize the effects of human modification: population density, land use change, access areas, and electric infrastructure. This index has been used and modified at different scales, but always following the main idea that the intensity of human influence is the result of the type of activity, the area that each activity occupies, and the accumulation of activities within large areas. Its values distributed on a map reveal the major patterns of human influence over the broad landscape. The advantages of the HF index lie in the fact that it uses publicly available geographic data for the majority of countries and hence it is easily reproducible by different researchers in different regions, and its calculations are statistically simple, with an explicative clarity that can be easily understood.
[post_title] => The human footprint in Mexico
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[questions] => Array
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[question] => Suppose you are asked to design a research study that would be viewed by the academic community as novel. Which of the following research studies would the passage author claim is the LEAST novel research question? A study investigating how the human footprint:
[value] => Array
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[answer] => 2
[description] => Reason for the Correct Answer:
This is a “Reasoning Beyond the Text” question, which means that it wants you to either apply or extrapolate the ideas in the passage to new situations or to assess how new information would impact the ideas presented in the passage. It is important to understand the assumptions underlying the article, and how new information may or may not shift the central thesis.
In paragraph 2, the author notes that while many studies have looked at how human development impacts physical environments, there are far fewer studies that have looked at how physical environments drive human development. Option 1 proposes a study that looks at how climate in biomes impacts human development. Option 3 looks at how ecological regions within the larger biomes impact human development. Option 4 looks at how ecoregions impact human development. Each of these focuses on the role of the environment on human development, providing novel contributions. Only the second option looks at the reverse (the impact of human activity on the environment), which falls into the same camp as most studies.
Option 2 is correct.
)
[answers] => Array
(
[0] => Array
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[each_answer] => A. is affected by large-scale climate in biomes such as deserts or tropical rainforests.
)
[1] => Array
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[each_answer] => B. produces ecological patterns and changes in response to agriculture and forestry.
)
[2] => Array
(
[each_answer] => C. is impacted by the geography of the region.
)
[3] => Array
(
[each_answer] => D. is shaped by ecoregions containing distinct species and vegetation.
)
)
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[1] => Array
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[quiz_unique_key] => 3873426850
[question] => Which of the following statements is NOT as strongly supported by the passage? Mexico’s landscape transformations are in part driven by:
[value] => Array
(
[answer] => 1
[description] => Reason for the Correct Answer:
This is a “Reasoning Within the Text” question. These items generally ask you to think about the author’s reasoning, such as what claim an author is trying to support with a piece of evidence, what assumption underlies a specific statement, or whether an argument is flawed.
Paragraph 4 mentions drought (option 2), agriculture (option 3), and disease (option 4) as factors that drove landscape transformation specific to Mexico. Although forestry (option 1) is mentioned in paragraph 1 as a general example of direct landscape transformation, it is never mentioned as something that actually impacted Mexico’s own landscape transformation.
Option 1 is correct.
)
[answers] => Array
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[0] => Array
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[each_answer] => A. Forestry
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[1] => Array
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[each_answer] => B. Drought
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[2] => Array
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[each_answer] => C. Agriculture
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[3] => Array
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[each_answer] => D. Disease
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[2] => Array
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[quiz_unique_key] => 83407773
[question] => Which of the following statements is most supported by the passage?
[value] => Array
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[answer] => 3
[description] => Reason for the Correct Answer:
This is a “Foundations of Comprehension” question which is asking you to recognize an accurate paraphrase or summary of the central theme or of particular statements in the passage, or to interpret word choices made by the author.
While the passage does mention environmental degradation (option 1) in paragraph 1, it mentions it in relation to byproducts of human activities. It does not directly make the link between land transformation and human settlement and degradation. The Human Footprint Index as defined in paragraph 5 includes measures of population density, land use change, access areas, and electric infrastructure which relate to direct modifications of the land, not indirect byproducts (option 2). The passage discusses in paragraph 3 that the historic dimension is especially relevant in Mexico, suggesting that the location of earlier settlements shaped its landscape transformations (option 3). Finally, the passage distinguishes between direct and indirect human activity in paragraph 1, but does not say anything about the relative impact of each on the environment (option 4).
Option 3 is correct.
)
[answers] => Array
(
[0] => Array
(
[each_answer] => A. Land transformation and human settlement greatly degrades environmental ecosystems.
)
[1] => Array
(
[each_answer] => B. The Human Footprint Index is a proxy measure of indirect human activity.
)
[2] => Array
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[each_answer] => C. Mexico’s history prior to European colonization greatly shaped its landscape transformation.
)
[3] => Array
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[each_answer] => D. Direct human activity degrades ecosystems more than indirect human activity.
)
)
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[3] => Array
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[quiz_unique_key] => 872728905
[question] => Suppose there is a strong correlation between historic distribution of pre-Hispanic settlements and regions with high human footprint values. In the face of such evidence, which of the following facts, if true, would most weaken the theory that pre-Hispanic settlements should be considered as having an impact on human development?
[value] => Array
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[answer] => 2
[description] => Reason for the Correct Answer:
This is a “Reasoning Beyond the Text” question, which means that it wants you to either apply or extrapolate the ideas in the passage to new situations or to assess how new information would impact the ideas presented in the passage. It is important to understand the assumptions underlying the article, and how new information may or may not shift the central thesis.
The question is asking you which option, if true, would discredit the idea that regions with pre-Hispanic settlements would predict where there is present-day human activity, independent of physical environment. However, if it so happens that pre-Hispanic societies chose to settle in places that were geographically hospitable (option 2), you could argue that physical geography is still the primary factor driving human development. Favorable climates, hospitable terrains, and an abundance of vegetation or water may drive human settlement just as much back then as it does today. The theory allows for other causes of human development, such as geography, so option 1 does not weaken the theory. Even if European colonies seriously weakened pre-Hispanic culture (option 3), that doesn’t explain the strong correlation, or refute the theory. The same logic applies to the fourth option. Technological advancement doesn’t explain why there is a strong relationship between regions that had high rates of pre-Hispanic settlement and present day patterns of human development and activity.
Option 2 is correct.
)
[answers] => Array
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[0] => Array
(
[each_answer] => A. Geography is also correlated with human footprint values.
)
[1] => Array
(
[each_answer] => B. Pre-Hispanic populations settled in regions with favorable climate, vegetation, and topography.
)
[2] => Array
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[each_answer] => C. European colonies seriously weakened pre-Hispanic culture and settlements.
)
[3] => Array
(
[each_answer] => D. The societies of the pre-Hispanic era were not nearly as technologically advanced as today.
)
)
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[4] => Array
(
[quiz_unique_key] => 3143847772
[question] => Which of the following best expresses the passage author’s central message?
[value] => Array
(
[answer] => 1
[description] => Reason for the Correct Answer:
This is a “Foundations of Comprehension” question which is asking you to recognize an accurate paraphrase or summary of the central theme or of particular statements in the passage, or to interpret word choices made by the author.
The author points out in paragraph 2 that most studies have focused on the effect of human development on physical geography (option 2). His main point is that the reverse is also true and often overlooked, namely that physical geography impacts human development (option 1). In addition, the author discusses the importance of history in paragraph 4, such as colonization and pre-Hispanic settlements in Mexico, in determining the trajectory of human development patterns geographically. While the author does seem to view the human footprint as a fairly important measure of landscape transformation (paragraph 5), it clearly not a “subjective measure” (option 3) since the author discusses how it is based upon “publicly available” data for objectively observable factors like “population density”. While the author mentions national history in paragraph 4, the author never explicitly criticizes other scientists for failing to take such a variable into consideration (option 4), and the passage never claims that ecological diversity is not studied enough. In fact, paragraph 1 notes that many former studies have studied the impact of human development on ecological systems.
Option 1 is correct.
)
[answers] => Array
(
[0] => Array
(
[each_answer] => A. Physical geography, as well as historical factors, may greatly impact human development.
)
[1] => Array
(
[each_answer] => B. The effect of human development on physical geography is an important area of study.
)
[2] => Array
(
[each_answer] => C. The human footprint is a subjective measure of landscape transformation in research.
)
[3] => Array
(
[each_answer] => D. National history and ecological diversity are not paid enough attention by scientists.
)
)
)
[5] => Array
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[quiz_unique_key] => 3143847772
[question] => The author mentions Mexico’s history of “human occupation and well-documented civilization collapses” in paragraph 4 most likely in order to:
[value] => Array
(
[answer] => 1
[description] => Reason for the Correct Answer:
This is a “Foundations of Comprehension” question which is asking you to recognize an accurate paraphrase or summary of the central theme or of particular statements in the passage, or to interpret word choices made by the author.
In paragraph 3 the author theorizes that it would be expected that “human developments and land transformations in Mexico follow the country’s complex environmental mosaic.” The author then goes on to challenge that expectation in the following paragraph with the sentence, “But land settlements and landscape transformations are not only the result of physical geography; there are also technological and historical components.” Thus, the purpose of mentioning Mexico’s history of colonization and civilization history is to underscore the “historical components” that also drive land settlement and landscape transformations. The purpose is not to criticize previous studies (option 2), nor to introduce an entirely different theory of landscape transformation (option 3). The author is merely introducing another factor to be considered in addition to geographical considerations (option 1). The passage never suggests that there is a causal relationship between human oppression and human development, nor is that the main focus of the historical analysis (option 4).
Option 1 is correct.
)
[answers] => Array
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[0] => Array
(
[each_answer] => A. emphasize an important factor in Mexico’s landscape transformation.
)
[1] => Array
(
[each_answer] => B. criticize previous studies for failing to take note of Mexico’s historical legacy.
)
[2] => Array
(
[each_answer] => C. introduce a completely new theory for human development in Mexico.
)
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[each_answer] => D. explain how patterns of human development are often the result of oppression.
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[559885|4] => B
[559885|5] => A
[559885|6] => A
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