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22 Jun 2026, 19:00
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71% (02:03) correct
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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
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
22 Jun 2026, 23:15
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when an animal dies, its soft parts decayed rapidly, leaving only harder parts.
if animal is buried quickly after death, these parts become fossilized.
if animal lacked hardened body parts, its remains only become fossilized under exceptional circumstances.
most animal species in early cambrian era lacked hardened body parts due to that paleontologists have difficulty accurately reconstructing early ecosystems.
A yes, when hardened parts are lacking, its remains fossilized under exceptional conditions and when we are told that animals from that era lacked hardened body parts, we can conclude that those animals may have left no trace in fossil records. so this perfectly concludes the passage.
B this is comparison of wrong stuff. not needed here.
C then they should not have difficulty in reconstructing since thpse fossil records have hardened body parts. so reject.
D this doesnt help to draw conclusion why they have difficulty in reconstruction. it rather compares two entities and then make one suggestion. reject.
E this is too extreme to be true. out. passage says difficulty in accurately reconstructing and not impossible to reconstruct. so reject.
choice A
if animal is buried quickly after death, these parts become fossilized.
if animal lacked hardened body parts, its remains only become fossilized under exceptional circumstances.
most animal species in early cambrian era lacked hardened body parts due to that paleontologists have difficulty accurately reconstructing early ecosystems.
A yes, when hardened parts are lacking, its remains fossilized under exceptional conditions and when we are told that animals from that era lacked hardened body parts, we can conclude that those animals may have left no trace in fossil records. so this perfectly concludes the passage.
B this is comparison of wrong stuff. not needed here.
C then they should not have difficulty in reconstructing since thpse fossil records have hardened body parts. so reject.
D this doesnt help to draw conclusion why they have difficulty in reconstruction. it rather compares two entities and then make one suggestion. reject.
E this is too extreme to be true. out. passage says difficulty in accurately reconstructing and not impossible to reconstruct. so reject.
choice A
Bunuel
22 Jun 2026, 23:18
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option A seems like the best option
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.- exactly what the passage says
B. There were more living species with hardened body parts than with only soft body parts in the early Cambrian era.- quite the opp, the passage mentions most animal species in the early Cambrian era lacked hardened body parts
C. There are no traces in the fossil record of early Cambrian animals that lacked bones ,teeth, or shell.- under some exceptional circumstances its possible so false
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.- no such mention, also quite the opp
E. It is impossible to reconstruct early Cambrian ecosystems accurately- its mentioned difficult to reconstruct not 'impossible'. difficult is not equal to reconstruct.
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.- exactly what the passage says
B. There were more living species with hardened body parts than with only soft body parts in the early Cambrian era.- quite the opp, the passage mentions most animal species in the early Cambrian era lacked hardened body parts
C. There are no traces in the fossil record of early Cambrian animals that lacked bones ,teeth, or shell.- under some exceptional circumstances its possible so false
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.- no such mention, also quite the opp
E. It is impossible to reconstruct early Cambrian ecosystems accurately- its mentioned difficult to reconstruct not 'impossible'. difficult is not equal to reconstruct.
