In an experiment, biologists

Answer choices

1. A

   Too Strong1% picked this

   All sea snails react to ocean turbulence in the same way as the sea snail

   The argument suggests that the reaction of the sea snail is typical, but it need not be the case that all sea snails would react the same way.

   1%
2. B

   Out of Scope6% picked this

   Sea snails are not ordinarily exposed to bright lights such as the one used in

   Whether the experience is common or rare is irrelevant. The question is whether the sea snail would normally respond to the bright light by tensing its "foot."

   6%
3. C

   Out of Scope - Opposite Group3% picked this

   The sea snail used in the experiment did not differ significantly from other members of its species in

   Other sea snails are not relevant to this argument about one specific sea snail.

   3%
4. D

   Correct85% picked this

   The appearance of a bright light alone would ordinarily not result in the sea snail's

   Why this is right

   This answer rules out a possible alternative explanation for the sea snail's reaction. In order to infer one explanation of the observed tense “foot” the argument must assume that something else does not explain it.

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

   85%
5. E

   Out of Scope5% picked this

   Tensing of the muscular "foot" in sea snails is an instinctual rather than a learned

   The argument is about whether the sea snail demonstrated a learned response to shining a bright light, not about whether tensing of the "foot" in response to ocean turbulence is learned or instinctual.

   5%