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Paleontologists have difficulty accurately reconstructing early Cambri

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Paleontologists have difficulty accurately reconstructing early Cambri  [#permalink]

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New post 26 Jul 2018, 02:53
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Paleontologists have difficulty accurately reconstructing early Cambrian ecosystems, since most animal species in the early Cambrian era lacked hardened body parts. When an animal dies, its soft parts decayed very rapidly, leaving only the harder parts, typically bones, teeth, or shell. If the animal is buried quickly enough after death, these parts can become fossilized. If an animal lacked hardened body parts, its remains only become fossilized under exceptional circumstances.

If the above is true, which of the following can be properly concluded from these statements?


A. When reconstructing an early Cambrian ecosystem, paleontologists must take into account that some animals that lived in that ecosystem may have left no trace in the fossil record.

B. There were more living species with hardened body parts than with only soft body parts in the early Cambrian era.

C. There are no traces in the fossil record of early Cambrian animals that lacked bones,teeth, or shell.

D. In an early Cambrian ecosystem containing hard-shelled trilobites and soft bodied priapullid worms, only the remains of the trilobites would be preserved in the fossil record.

E. It is impossible to reconstruct early Cambrian ecosystems accurately

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Re: Paleontologists have difficulty accurately reconstructing early Cambri  [#permalink]

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New post 26 Jul 2018, 03:11
Bunuel wrote:
Paleontologists have difficulty accurately reconstructing early Cambrian ecosystems, since most animal species in the early Cambrian era lacked hardened body parts. When an animal dies, its soft parts decayed very rapidly, leaving only the harder parts, typically bones, teeth, or shell. If the animal is buried quickly enough after death, these parts can become fossilized. If an animal lacked hardened body parts, its remains only become fossilized under exceptional circumstances.


A. When reconstructing an early Cambrian ecosystem, paleontologists must take into account that some animals that lived in that ecosystem may have left no trace in the fossil record. --> Correct, can be read between the lines of the claim, nothing too extreme

B. There were more living species with hardened body parts than with only soft body parts in the early Cambrian era. --> Opposite

C. There are no traces in the fossil record of early Cambrian animals that lacked bones,teeth, or shell. --> Too extreme

D. In an early Cambrian ecosystem containing hard-shelled trilobites and soft bodied priapullid worms, only the remains of the trilobites would be preserved in the fossil record. --> Too extreme

E. It is impossible to reconstruct early Cambrian ecosystems accurately --> Too extreme

Hence, A.
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Re: Paleontologists have difficulty accurately reconstructing early Cambri  [#permalink]

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New post 26 Jul 2018, 03:56
Bunuel wrote:
Paleontologists have difficulty accurately reconstructing early Cambrian ecosystems, since most animal species in the early Cambrian era lacked hardened body parts. When an animal dies, its soft parts decayed very rapidly, leaving only the harder parts, typically bones, teeth, or shell. If the animal is buried quickly enough after death, these parts can become fossilized. If an animal lacked hardened body parts, its remains only become fossilized under exceptional circumstances.

If the above is true, which of the following can be properly concluded from these statements?


A. When reconstructing an early Cambrian ecosystem, paleontologists must take into account that some animals that lived in that ecosystem may have left no trace in the fossil record.

B. There were more living species with hardened body parts than with only soft body parts in the early Cambrian era.

C. There are no traces in the fossil record of early Cambrian animals that lacked bones,teeth, or shell.

D. In an early Cambrian ecosystem containing hard-shelled trilobites and soft bodied priapullid worms, only the remains of the trilobites would be preserved in the fossil record.

E. It is impossible to reconstruct early Cambrian ecosystems accurately


Here is my reasoning

Since animals with soft bodies decayed and left no remains and since animals with hardened body parts left remains i COULD :lol: safely conclude that in an early Cambrian ecosystem containing hard-shelled trilobites and soft bodied priapullid worms, only the remains of the trilobites would be preserved in the fossil record.

But If an animal lacked hardened body parts, its remains only become fossilized under exceptional circumstances. Hence IMO A
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Re: Paleontologists have difficulty accurately reconstructing early Cambri  [#permalink]

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New post 30 Jul 2018, 04:37
Bunuel wrote:
Paleontologists have difficulty accurately reconstructing early Cambrian ecosystems, since most animal species in the early Cambrian era lacked hardened body parts. When an animal dies, its soft parts decayed very rapidly, leaving only the harder parts, typically bones, teeth, or shell. If the animal is buried quickly enough after death, these parts can become fossilized. If an animal lacked hardened body parts, its remains only become fossilized under exceptional circumstances.

If the above is true, which of the following can be properly concluded from these statements?


A. When reconstructing an early Cambrian ecosystem, paleontologists must take into account that some animals that lived in that ecosystem may have left no trace in the fossil record.

B. There were more living species with hardened body parts than with only soft body parts in the early Cambrian era.

C. There are no traces in the fossil record of early Cambrian animals that lacked bones,teeth, or shell.

D. In an early Cambrian ecosystem containing hard-shelled trilobites and soft bodied priapullid worms, only the remains of the trilobites would be preserved in the fossil record.

E. It is impossible to reconstruct early Cambrian ecosystems accurately



KAPLAN OFFICIAL SOLUTION:




Correct Choice: (A)

In order to “properly conclude,” or infer, something new, we often must combine pieces of evidence from the stimulus to draw a conclusion. Choice (A) properly combines the information that paleontologists attempt to reconstruct early Cambrian ecosystems with the fact that only “under exceptional circumstances” do animals with soft body parts become fossilized. In addition, the tone of (A) reflects the moderate language of the stimulus (“difficulty ... most ... may ... exceptional circumstances”).

Choice (B) contradicts information in the passage; we are told in the first sentence that: “most animal species...lacked hardened body parts”.

Choices (C) and (D) erroneously translates “typically” preserved hard parts and “exceptional circumstances” under which soft-parted animals are preserved into the extreme assertions that no traces are found of animals lacking those parts.

Choice (E) is also too extreme: “difficulty” becomes “impossible to”referring to the chances of accurate reconstruction.
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New to the Math Forum?
Please read this: Ultimate GMAT Quantitative Megathread | All You Need for Quant | PLEASE READ AND FOLLOW: 12 Rules for Posting!!!

Resources:
GMAT Math Book | Triangles | Polygons | Coordinate Geometry | Factorials | Circles | Number Theory | Remainders; 8. Overlapping Sets | PDF of Math Book; 10. Remainders | GMAT Prep Software Analysis | SEVEN SAMURAI OF 2012 (BEST DISCUSSIONS) | Tricky questions from previous years.

Collection of Questions:
PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. ,11 Mixed Questions, 12 Fresh Meat

DS: 1. DS tough questions; 2. DS tough questions part 2; 3. DS tough questions part 3; 4. DS Standard deviation; 5. Inequalities; 6. 700+ GMAT Data Sufficiency Questions With Explanations; 7 Tough and tricky exponents and roots questions; 8 The Discreet Charm of the DS; 9 Devil's Dozen!!!; 10 Number Properties set., 11 New DS set.


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Re: Paleontologists have difficulty accurately reconstructing early Cambri &nbs [#permalink] 30 Jul 2018, 04:37
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