Logical Reasoning

PT127 · S2 · Q4 The song of the yellow warbler

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The song of the yellow warbler signals to other yellow warblers that a particular area has been appropriated by the singer as its own feeding territory.

Evidence

However, a warbler sings a special M → S song when it molts (sheds its feathers).

Other yellow warblers will not enter S → ~OWE the smaller core territory of a yellow warbler singing its molting song.

Conclusion

Therefore yellow warblers, have no M → ~CF competition for the food supply within the range of their restricted flying.

Evaluate

The argument assumes that if a ~OWE → ~CF molting warbler has no other warblers enter its core territory, then it has no competition for food.

4.

The argument makes which one of the following assumptions?

  1. The core areas contain just

    Too Strong

    The argument does not say yellow warblers who sing will find sufficient food, but rather that they won't face competition.

    7% picked this

  2. Warblers are the only molting

    Too Strong

    Too Strong: the only Out of Scope: other molting birds Whether other molting birds lay claim to areas of feeding territories is not relevant to the argument.

    2% picked this

  3. Correct

    There are no birds other

    Why this is right

    This is a piece of the required ~OWE → ~CF assumption. In order for the absence of other warblers to imply no competition for food. It must be assumed that no other birds compete with yellow warblers for food.

    Skill tested: Necessary Assumption · how this choice captures the argument's function is the move to repeat next time.

    84% picked this

  4. Warblers often share their feeding

    Weaken

    If warblers often share their feeding areas with other kinds of birds (even if sometimes they do not eat the same insects or seeds as warblers do). Warblers are more likely to face competition for food.

    4% picked this

  5. The core areas of each

    Too Strong

    Each area need not be exactly the same size.

    3% picked this

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