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Zorluk: OrtaCommand of Evidence: Textual

Marine biologist Dr. Clara Vance and her team investigated how ocean acidification affects the shell-building behavior of the marine snail *Anachis avarosa*. The team exposed groups of snails to either current seawater pH levels or lower pH levels simulating projected ocean acidification. While overall calcification rates declined in the low-pH environment, Vance hypothesized that *Anachis avarosa* selectively allocates its limited calcium carbonate resources to preserve the structural integrity of the shell's apex—which shields vital internal organs—at the expense of the outer body whorl. Which finding from the team's study, if true, would most directly support Dr. Vance's hypothesis?

  1. Snails in the low-pH environment maintained a shell apex thickness similar to that of snails in current seawater, but had a significantly thinner body whorl.Cevap
  2. B
    Snails in the low-pH environment experienced higher rates of successful predator attacks on their body whorls than did snails in current seawater.
  3. C
    Snails in both pH environments showed a uniform reduction in both apex and body whorl thickness when predator cues were introduced to the seawater.
  4. D
    Snails exposed to the low-pH environment showed a general, uniform decrease in overall shell mass and calcification rates.

Cevap

The finding that snails in the low-pH environment maintained a shell apex thickness similar to that of snails in current seawater, but had a significantly thinner body whorl.
The correct answer is the finding that snails in the low-pH environment maintained a shell apex thickness similar to that of snails in current seawater but had a significantly thinner body whorl. This result directly supports Dr. Vance's hypothesis because it demonstrates that when resources are limited under acidification, the snails prioritized calcification in the apex (keeping it comparable to the control group) while sacrificing calcification in the body whorl (which became thinner).

Adım Adım Çözüm

1
Identify the core claim in the text.
The core claim is that *Anachis avarosa* snails in low-pH environments selectively allocate resources to maintain the thickness of the shell's apex at the expense of the outer body whorl.
To support this claim, the correct choice must demonstrate a disparity in calcification where the apex is preserved but the body whorl is not.
2
Evaluate the choices to see which one details this specific disparity.
The finding that snails maintained apex thickness but had a significantly thinner body whorl in low pH directly shows this resource prioritization.
This shows a selective allocation rather than a general decline or a uniform reduction across both parts of the shell.

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