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ACT® Science

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Scientist #3

ACTSCI-ZKJX4G

Base your answers to this question on this passage, as well as information from the original passage and data chart, as another scientist presents her findings concerning the Lucy fossil.

Scientist #3

I have also done research on the reconstructed fossil. My study focused on reconstructing the inner ear of the fossil. We can learn quite a bit from the construction of the inner ear, including how the specimen kept its balance, how it stood, how it walked, and how it could live. My research shows that the position, shape, length, and structure of the inner ear canal would have Lucy needing four limbs to balance herself while walking, as she would need more surface area to support her weight. We also learned from the structure that the pressure in the inner ear would allow her to live comfortably at slightly higher altitudes.

Is Lucy a Human or an Ape

Which choice correctly states which scientist would use Scientist #3’s research as evidence for their position?

A

Scientist #2 - The new evidence supports the idea of walking on two legs.

B

Scientist #2 - The new evidence supports the idea of knuckle walking.

C

Scientist #1 - The new evidence supports a fossil with a barrel shaped chest.

D

Scientist #1 - The new evidence supports a fossil with upright posture.