B calculated.
C understood.
D planned.
43 What did the researchers find in the experiment?
A Human walking used more energy than bipedal walking in chimps.
B One chimp used about the same energy in walking on two legs as on all fours.
C Two chimps used more energy walking on two legs.
D Three chimps used less energy walking on two legs.
44 The word quadrupeds in paragraph 6 is a technical word for
A creatures with two feet.
B creatures with four feet.
C creatures with six feet.
D creatures with eight feet.
45 What does fossil and molecular evidence tell US about our earliest ancestors?
A They experienced more climate changes than we do today.
B They were forced to travel between food patches.
C They were much taller than modern man.
D They could cover more ground with less energy.
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