# PTE Reading MCM #5: Theoretical Perspectives on...

Reading: Multiple Choice, Multiple Answers #5 - Level 1 - Feeds Reading

> Read the text and answer the question by choosing all the options that are correct. More than one answer is correct, and a wrong choice costs a point.

The controversial concept of terraforming, or changing a planet's atmosphere to make it more habitable for humans, is still no more than a theoretical debate. However, the most recent data from two American Mars Rovers suggest that the terraforming of Mars may be more feasible than previously thought. The rovers found evidence of stratification patterns and cross-bedding in rock on the edges of craters, as well as chlorine and bromine, suggestive of a large body of saltwater. If Mars once held water, it is possible that its atmosphere was at one time somewhat similar to Earth's. Even if this theory were true, however, scientists would have to prevent a recurrence of the desiccation of the Martian atmosphere once it is made habitable, as well as endeavor to preserve any extant life. Of course, until a reliable method of transporting humans to Mars is developed, any possibility of terraforming is mere conjecture.

It can be inferred from the passage that the author would be most likely to agree with which of the following statements?

- Weather conditions on Mars are conducive to human habitation is not the only issue that limits realistic consideration of terraforming.
- If we terraform Mars, it will be important to think about the long-term effects of changing a planet's climate.
- It is highly likely, according to recent data, that there is, or was at one time, life on Mars.

## Answer

- Weather conditions on Mars are conducive to human habitation is not the only issue that limits realistic consideration of terraforming.
- If we terraform Mars, it will be important to think about the long-term effects of changing a planet's climate.

## Explanation

The correct choices identify that multiple logistical and environmental factors complicate the process, and that future efforts must account for long-term stability and preservation.

What to watch: The author lists problems beyond conditions on Mars, such as transport. Until humans can get there, terraforming "is mere conjecture." Scientists must also "prevent a recurrence of the desiccation," a long-term effect. The life option overstates the text, which only mentions preserving "any extant life," not that life is likely.

## Hints

- Look for statements that are directly supported by the text versus those that are speculative or unsupported.
- The text mentions water evidence, but does it confirm the existence of life? Be careful with strong claims.

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