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24 Feb 2020, 16:15
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Difficulty:
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Question Stats:
88% (01:24) correct
12%
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wrong
based on 308
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History
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Researchers have discovered a new poison, bromethalin, that is lethal to all rats, even to those species that have become immune to other poisons, as well as to those rats that eat only the most minute quantities. Tests have demonstrated that rats will not learn to avoid bromethalin and that carcasses of rats killed by bromethalin pose no threat to the well-being of other animals.
Which of the following statements, if true, would support the researchers' claim that carcasses of rats killed by bromethalin will not pose a threat to other animals?
(A) Rats that consume bromethalin die immediately.
(B) Animals, prompted by curiosity, often examine carcasses that appear in their territory.
(C) Chemicals in the digestive tract of dead rats quickly break bromethalin down into a nontoxic substance.
(D) Traces of bromethalin remain in the rat's mouth and saliva after the rat eats the poison.
(E) Certain animals are scavengers and feed habitually on refuse and dead flesh.
Which of the following statements, if true, would support the researchers' claim that carcasses of rats killed by bromethalin will not pose a threat to other animals?
(A) Rats that consume bromethalin die immediately.
(B) Animals, prompted by curiosity, often examine carcasses that appear in their territory.
(C) Chemicals in the digestive tract of dead rats quickly break bromethalin down into a nontoxic substance.
(D) Traces of bromethalin remain in the rat's mouth and saliva after the rat eats the poison.
(E) Certain animals are scavengers and feed habitually on refuse and dead flesh.
22 Mar 2020, 22:01
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Conclusion:carcasses of rats killed by bromethalin will not pose a threat to other animals
premise:bromethalin is lethal to all species.
Strengthen ,Prethink : bromethalin gets converted to some nontoxic
(A) Rats that consume bromethalin die immediately. : But carcass can still hold poison ,threat to other animal.
(B) Animals, prompted by curiosity, often examine carcasses that appear in their territory. :Same reason as A
(C) Chemicals in the digestive tract of dead rats quickly break bromethalin down into a nontoxic substance.
(D) Traces of bromethalin remain in the rat's mouth and saliva after the rat eats the poison. : Clearly threat to other animal.
(E) Certain animals are scavengers and feed habitually on refuse and dead flesh. :Same reason as A
premise:bromethalin is lethal to all species.
Strengthen ,Prethink : bromethalin gets converted to some nontoxic
(A) Rats that consume bromethalin die immediately. : But carcass can still hold poison ,threat to other animal.
(B) Animals, prompted by curiosity, often examine carcasses that appear in their territory. :Same reason as A
(C) Chemicals in the digestive tract of dead rats quickly break bromethalin down into a nontoxic substance.
(D) Traces of bromethalin remain in the rat's mouth and saliva after the rat eats the poison. : Clearly threat to other animal.
(E) Certain animals are scavengers and feed habitually on refuse and dead flesh. :Same reason as A
11 Jun 2025, 04:58
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Premise (Given facts):
Bromethalin is lethal to all rats, even resistant ones.
Rats do not avoid bromethalin, and even tiny amounts are lethal.
Carcasses of rats killed by bromethalin do not pose a threat to other animals.
Conclusion (Claim):
Rat carcasses killed by bromethalin are safe for other animals (won’t harm them).
Pre-thinking: What would support this?
To support the conclusion, we want something that explains why other animals won’t get poisoned when they:
Eat the dead rat, or Come into contact with its body.
So, we are looking for a statement that says:
“There’s no dangerous poison left in the rat after it dies.”
✅ Let’s Evaluate the Choices:
(A) Rats that consume bromethalin die immediately.
Sounds dramatic, but irrelevant.
Just because rats die fast doesn’t tell us anything about whether the carcass is safe afterward.
❌ Doesn’t support the conclusion.
(B) Animals, prompted by curiosity, often examine carcasses that appear in their territory.
This is about animal behavior, not the safety of the carcass.
Even if animals examine carcasses, the question is: do they get hurt by it?
❌ Neutral / irrelevant.
(C) Chemicals in the digestive tract of dead rats quickly break bromethalin down into a nontoxic substance.
If bromethalin becomes nontoxic inside the rat's body, then other animals eating or touching it won’t be harmed.
✅ Strongly supports the claim.
(D) Traces of bromethalin remain in the rat's mouth and saliva after the rat eats the poison.
This weakens the conclusion!
If poison remains in the mouth, an animal licking or biting the carcass might ingest it.
❌ Goes against the argument.
(E) Certain animals are scavengers and feed habitually on refuse and dead flesh.
This tells us what animals eat, not whether the rat carcass is safe.
Just because animals eat dead things doesn’t mean they won’t be harmed by this one.
❌ Neutral / not supportive.
Because it explains why the poison in the dead rat is no longer harmful, directly supporting the conclusion.
Bromethalin is lethal to all rats, even resistant ones.
Rats do not avoid bromethalin, and even tiny amounts are lethal.
Carcasses of rats killed by bromethalin do not pose a threat to other animals.
Conclusion (Claim):
Rat carcasses killed by bromethalin are safe for other animals (won’t harm them).
Pre-thinking: What would support this?
To support the conclusion, we want something that explains why other animals won’t get poisoned when they:
Eat the dead rat, or Come into contact with its body.
So, we are looking for a statement that says:
“There’s no dangerous poison left in the rat after it dies.”
✅ Let’s Evaluate the Choices:
(A) Rats that consume bromethalin die immediately.
Sounds dramatic, but irrelevant.
Just because rats die fast doesn’t tell us anything about whether the carcass is safe afterward.
❌ Doesn’t support the conclusion.
(B) Animals, prompted by curiosity, often examine carcasses that appear in their territory.
This is about animal behavior, not the safety of the carcass.
Even if animals examine carcasses, the question is: do they get hurt by it?
❌ Neutral / irrelevant.
(C) Chemicals in the digestive tract of dead rats quickly break bromethalin down into a nontoxic substance.
If bromethalin becomes nontoxic inside the rat's body, then other animals eating or touching it won’t be harmed.
✅ Strongly supports the claim.
(D) Traces of bromethalin remain in the rat's mouth and saliva after the rat eats the poison.
This weakens the conclusion!
If poison remains in the mouth, an animal licking or biting the carcass might ingest it.
❌ Goes against the argument.
(E) Certain animals are scavengers and feed habitually on refuse and dead flesh.
This tells us what animals eat, not whether the rat carcass is safe.
Just because animals eat dead things doesn’t mean they won’t be harmed by this one.
❌ Neutral / not supportive.
Because it explains why the poison in the dead rat is no longer harmful, directly supporting the conclusion.
