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Modern-day snakes are believed to evolve from four-legged lizards, but

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Modern-day snakes are believed to evolve from four-legged lizards, but  [#permalink]

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New post 16 Jul 2018, 01:23
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Modern-day snakes are believed to evolve from four-legged lizards, but scientists were divided over whether that phase of evolution occurred on land or in the sea; the recent discovery of fossils of a land-dwelling snake with two legs provides new information for the ongoing debate.


A. evolve from four-legged lizards, but scientists were

B. have evolved from four-legged lizards, but scientists are

C. evolve from four-legged lizards, but scientists are

D. have evolved from four-legged lizards, but scientists were

E. be evolving from four-legged lizards, but scientists were

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Re: Modern-day snakes are believed to evolve from four-legged lizards, but  [#permalink]

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New post 16 Jul 2018, 01:37
+1 for B.

A. evolve from four-legged lizards, but scientists were

B. have evolved from four-legged lizards, but scientists are --> Correct, scientists 'are' over 'were' because its an ongoing debate

C. evolve from four-legged lizards, but scientists are

D. have evolved from four-legged lizards, but scientists were

E. be evolving from four-legged lizards, but scientists were

Hence, B.
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Modern-day snakes are believed to evolve from four-legged lizards, but  [#permalink]

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New post Updated on: 16 Jul 2018, 09:33
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'Were' is the wrong tense for a current phenomenon. Remove A, D, and E. between B and C, to have evolved as in B is the correct form of tense for an event that started in the past and extending through now.
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Originally posted by daagh on 16 Jul 2018, 07:41.
Last edited by daagh on 16 Jul 2018, 09:33, edited 1 time in total.
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Re: Modern-day snakes are believed to evolve from four-legged lizards, but  [#permalink]

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New post 16 Jul 2018, 08:34
daagh wrote:
'Were' is the wrong tense for a current phenomenon. Remove A, D, and E. between B and C, to have evolved as in C is the correct form of tense for an event that started in the past and extending through now.
B uses have evolved...do you mean B ??

I vote for B as the right answer.

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Re: Modern-day snakes are believed to evolve from four-legged lizards, but  [#permalink]

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New post 16 Jul 2018, 09:27
Bunuel wrote:
Modern-day snakes are believed to evolve from four-legged lizards, but scientists were divided over whether that phase of evolution occurred on land or in the sea; the recent discovery of fossils of a land-dwelling snake with two legs provides new information for the ongoing debate.


A. evolve from four-legged lizards, but scientists were

B. have evolved from four-legged lizards, but scientists are

C. evolve from four-legged lizards, but scientists are

D. have evolved from four-legged lizards, but scientists were

E. be evolving from four-legged lizards, but scientists were


Highlighted part suggests the reference to something in the present context thus Present Perfect is preferred, Answer must be (B) for the Red highlighted errors in the options.
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Re: Modern-day snakes are believed to evolve from four-legged lizards, but  [#permalink]

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New post 16 Jul 2018, 09:32
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Thanks, Sonal. You are correct. I meant B. I am editing my post
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Re: Modern-day snakes are believed to evolve from four-legged lizards, but   [#permalink] 16 Jul 2018, 09:32
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