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akela
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Hine' s emerald dragonflies are an endangered species that live in wet 21 Jan 2018, 10:44
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25% (medium)

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76% (01:42) correct 24% (01:56) wrong based on 321 sessions

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Hine' s emerald dragonflies are an endangered species that live in wetlands. The larvae of these dragonflies can survive only in the water, where they are subject to predation by several species including red devil crayfish. Surprisingly, the dragonfly populations are more likely to remain healthy in areas where red devil crayfish are present than in areas without red devil crayfish.

Which one of the following, if true, most helps to explain the surprising fact?

(A) Red devil crayfish dig chainbers that remain filled with water even vvhen the sunounding wetlands dry up.
(B) Red devil crayfish present no threat to adult Hine's emerald dragonflies.
(C) The varied diet of the red devil crayfish does not include any animal species that prey on dragonfly larvae.
(D) Red devil crayfish are found in many more locations than Hine's emerald dragonflies are.
(E) Populations of red devil crayfish in a wetland do not drop significantly if the local population of Hine 's emerald dragonflies dies out.

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Hine' s emerald dragonflies are an endangered species that live in wet 21 Jan 2018, 11:28
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A... Water is essential for larvae survival.

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Hine' s emerald dragonflies are an endangered species that live in wet 14 Mar 2020, 07:28
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Can some explain the argument as well ad option I didn't understand the gist

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Hine' s emerald dragonflies are an endangered species that live in wet 14 Mar 2020, 08:47
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(A) Red devil crayfish dig chainbers that remain filled with water even vvhen the sunounding wetlands dry up. --- Red dragon fly provides water which is essential for survival. hence Correct
(B) Red devil crayfish present no threat to adult Hine's emerald dragonflies. --- Not sufficient for the survival of entire dragonfly population's survival
(C) The varied diet of the red devil crayfish does not include any animal species that prey on dragonfly larvae. --- Still crayfish are a threat for dragonfly
(D) Red devil crayfish are found in many more locations than Hine's emerald dragonflies are. -- Irrelevant for dragonfly's survival argument
(E) Populations of red devil crayfish in a wetland do not drop significantly if the local population of Hine 's emerald dragonflies dies out. -- Irrelevant as the argument is about dragonfly's population and not about the crayfish population
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Hine' s emerald dragonflies are an endangered species that live in wet 22 Jul 2021, 09:53
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Hine' s emerald dragonflies are an endangered species that live in wetlands. The larvae of these dragonflies can survive only in the water, where they are subject to predation by several species including red devil crayfish. Surprisingly, the dragonfly populations are more likely to remain healthy in areas where red devil crayfish are present than in areas without red devil crayfish.

Which one of the following, if true, most helps to explain the surprising fact?

(A) Red devil crayfish dig chainbers that remain filled with water even vvhen the sunounding wetlands dry up. - STRENGTHENER.
(B) Red devil crayfish present no threat to adult Hine's emerald dragonflies. - WEAKENER. Half cooked.
(C) The varied diet of the red devil crayfish does not include any animal species that prey on dragonfly larvae. - WEAKENER.
(D) Red devil crayfish are found in many more locations than Hine's emerald dragonflies are. - NEUTRAL. No relation at all.
(E) Populations of red devil crayfish in a wetland do not drop significantly if the local population of Hine 's emerald dragonflies dies out. - WEAKENER.

If existence of red devil crayfish directly or indirectly helps dragonflies survive then that is the answer to go for.
A gives us a reason that tells us that during dry season the larvae can survive in the chambers dug by crayfish.

Answer A.
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