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Red molluscs arrive on New Mexico's beaches to lay eggs during

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Red molluscs arrive on New Mexico's beaches to lay eggs during [#permalink]

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New post 09 Aug 2017, 09:50
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Red molluscs arrive on New Mexico's beaches to lay eggs during early March. Some native shorebirds depend on these eggs for food during their annual spring migration to their northern breeding grounds. New Mexico's Mollusc population has declined recently. This decline, however, poses no serious threat to the migrating shorebird populations: by remaining longer in New Mexico, the birds will be able to eat enough eggs to allow them to complete their migration.

Which of the following, if true, most seriously weakens the argument?

A. More Red Molluscs are found on New Mexico's beaches than in any other area that the migrating birds pass through.
B. Red molluscs do not conceal their eggs.
C. Amongst the foods available to the birds on New Mexico's beaches, Mollusc eggs are the most nutritious and accessible.
D. Extensive harvesting of Red molluscs by humans is responsible for the decline in the number of Red molluscs on New Mexico's beaches.
E. The earlier in the season the shorebirds complete their migration, the more likely they are to breed successfully.
[Reveal] Spoiler: OA

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Re: Red molluscs arrive on New Mexico's beaches to lay eggs during [#permalink]

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New post 09 Aug 2017, 10:13
A. More Red Molluscs are found on New Mexico's beaches than in any other area that the migrating birds pass through.: This wont affect the shorebird's population
B. Red molluscs do not conceal their eggs.: Not related. Eggs are going to be eaten anyways
C. Amongst the foods available to the birds on New Mexico's beaches, Mollusc eggs are the most nutritious and accessible.: Fine, they are accessible, but egg's accessibility isn't changing
D. Extensive harvesting of Red molluscs by humans is responsible for the decline in the number of Red molluscs on New Mexico's beaches. : out of scope
E. The earlier in the season the shorebirds complete their migration, the more likely they are to breed successfully.: This will directly affect the migration shorebird's population

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Re: Red molluscs arrive on New Mexico's beaches to lay eggs during [#permalink]

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New post 09 Aug 2017, 10:24
Option E weakens the conclusion by adding an additional premise which says that staying longer hours on the shore might have a deleterious effect on the shorebirds ability to breed once the birds complete their migration.

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Re: Red molluscs arrive on New Mexico's beaches to lay eggs during   [#permalink] 09 Aug 2017, 10:24
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Red molluscs arrive on New Mexico's beaches to lay eggs during

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