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Punctuated equilibrium is a biological theory that regards evolution

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Punctuated equilibrium is a biological theory that regards evolution  [#permalink]

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New post 30 Jun 2018, 01:25
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Punctuated equilibrium is a biological theory that regards evolution not as a gradual process by which one species slowly and continuously transforms into another, rather a process in which species were remaining stable for long periods and then have dramatic change in isolated short bursts.

A. rather a process in which species were remaining stable for long periods and then have dramatic change
B. but as a process in which species remain stable for long periods and change dramatically
C. but a process in which species remain stable for long periods and then have dramatic change
D. but as a process in which species remained stable for long periods and changing dramatically
E. but also as a process in which species were remaining stable for long periods and were changing dramatically

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Re: Punctuated equilibrium is a biological theory that regards evolution  [#permalink]

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New post 30 Jun 2018, 01:45
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B .. Goes with not as .. But as.. Also the tense form is correctly used ..

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Re: Punctuated equilibrium is a biological theory that regards evolution  [#permalink]

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New post 30 Jun 2018, 17:26
Requires idiom .. Not as ...... but as. So eliminate A C and E

B. but as a process in which species remain stable for long periods and change dramatically
Looks fine.

D. but as a process in which species remained stable for long periods and changing dramatically
Remained and changing - Doesn't make sense.
B it is
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Re: Punctuated equilibrium is a biological theory that regards evolution  [#permalink]

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New post 30 Jun 2018, 19:46
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Punctuated equilibrium is a biological theory that regards evolution not as a gradual process by which one species slowly and continuously transforms into another, rather a process in which species were remaining stable for long periods and then have dramatic change in isolated short bursts.

A. rather a process in which species were remaining stable for long periods and then have dramatic change -- parallelism error - not as .. rather", tense error "were remaining stable" and "have dramatic change" - these two tense diversion from the present simple tense in first clause is unnecessary.
B. but as a process in which species remain stable for long periods and change dramatically - CORRECT
C. but a process in which species remain stable for long periods and then have dramatic change - parallelism error - not as .. but"
D. but as a process in which species remained stable for long periods and changing dramatically - parallelism error - remained and changing
E. but also as a process in which species were remaining stable for long periods and were changing dramatically - wrong use of tense - past progressive is trying to describe the event of evolution itself in past whereas intended meaning is to describe what the theory proposes about evolution.
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Re: Punctuated equilibrium is a biological theory that regards evolution  [#permalink]

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New post 22 Aug 2018, 00:19
First of all, the conjunction. The correct idiom is “not X but Y.” We need the second half of the sentence to begin with the word “but. (A) and (D) do not complete this idiom correct, so they are wrong. The construction “not X but also Y” confuses the “not X but Y” idiom with the “not only X but also Y” idiom — “not X but also Y” does not construct either correctly, so (E) is wrong.

Furthermore, the X and Y must be parallel. The first part begins “as a gradual process by which …”, so the second part, after the “but”, must also begin with “as” — only (B) does this, so that’s the correct answer.

Notice also the verb tenses. (D) has a past tense in parallel with a present tense, so that’s wrong. Similarly, (A) has the past progressive in parallel with the present tense, so that’s also wrong. (E) has both verbs in the past progressive tense, but that’s unusual, because what we’re discussing is an ongoing process, how evolution continues to take place in the natural world. Both (B) and (C) have the simple present test, which is correct and which mirrors the simple present test of “transforms” before the underlined part. (C) does have the awkward wording, “have dramatic change”, instead of “change dramatically” — as a general rule, if you have a choice — action as noun vs. action as verb — always choose the latter. Actions should be expressed as verbs as much as possible. Again, this makes (B) the best answer.

Answer = B.
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Re: Punctuated equilibrium is a biological theory that regards evolution  [#permalink]

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New post 13 Sep 2018, 06:34

Official Explanation


This is a SC question about punctuated equilibrium.

Split #1a: The correct idiom is "not X but Y." We need the second half of the sentence to begin with the word "but. (A) does not complete this idiom correct, so they are wrong. The construction "not X but also Y" confuses the "not X but Y" idiom with the "not only X but also Y" idiom — "not X but also Y" does not construct either correctly, so (E) is wrong.

Split 1b: this X and Y must be parallel. The first part begins "as a gradual process by which …", so the second part, after the "but", must also begin with "as" — only (B) does this, so that's the correct answer.

Split #2: notice also the verb tenses. (D) has a past tense in parallel with a present tense, so that doesn't fit the context. Similarly, (A) has the past progressive in parallel with the present tense, so that's also inappropriate to this context. (E) has both verbs in the past progressive tense, but that's unusual, because what we're discussing is an ongoing process, how evolution continues to take place in the natural world. Both (B) and (C) have the simple present test, which is correct and which mirrors the simple present test of "transforms" before the underlined part. (C) does have the awkward wording, "have dramatic change", instead of "change dramatically" — as a general rule, if you have a choice — action as noun vs. action as verb — always choose the latter. Actions should be expressed as verbs as much as possible. Again, this makes (B) the best answer.

Answer =B.
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Re: Punctuated equilibrium is a biological theory that regards evolution &nbs [#permalink] 13 Sep 2018, 06:34
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