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Difficulty: HardExplicit Details

In a 2025 analysis of coprolites (fossilized feces) recovered from the Mylodon Cave in Patagonia, paleoclimatologist Dr. Clara Martinez and her team identified the preserved DNA of several plant species to reconstruct the diet of the extinct ground sloth *Mylodon darwinii*. While previous research suggested that *M. darwinii* fed exclusively on tough grasses, Martinez’s analysis revealed that the sloth's diet actually varied seasonally. Specifically, during the wet spring months, the sloth consumed a high proportion of *Empetrum rubrum* (dwarf shrubs), whereas its winter diet consisted almost entirely of *Stipa* grass species. Furthermore, the researchers noted that the coprolites contained significant traces of sediment, indicating that *M. darwinii* frequently ingested soil while feeding on low-growing vegetation.

Based on the text, which statement is true about the diet of *Mylodon darwinii*?

  1. A
    It consisted entirely of tough grasses regardless of the season.
  2. B
    It changed seasonally because winter grasses became scarce in Patagonia.
  3. It included dwarf shrubs during the wet spring months.Answer
  4. D
    It was directly responsible for the preservation of the coprolites inside the cave.

Answer

The diet of Mylodon darwinii included dwarf shrubs during the wet spring months.
The passage explicitly states that during the wet spring months, the sloth consumed a high proportion of Empetrum rubrum, which are dwarf shrubs. This directly supports the statement that the diet included dwarf shrubs during the wet spring months.

Step-by-Step Solution

1
Read the passage to locate details concerning the diet of Mylodon darwinii.
Identified that the diet varied seasonally, featuring a high proportion of dwarf shrubs (Empetrum rubrum) in the wet spring months and grass species (Stipa) in the winter.
To find the factual details explicitly stated in the text.
2
Evaluate the given choices against the identified explicit details.
Determined that the diet including dwarf shrubs in the wet spring is directly supported, while the other choices are either directly contradicted, speculate beyond the text, or make unrelated claims.
To select the option that is factually accurate according to the text without any extrapolation.

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Explicit Details
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