Compared to the knuckle-walking of chimpanzees, modern human ...

[Yolanda]

Compared to the knuckle-walking of chimpanzees, modern human bipedal walking
 
  A) is much less energy efficient
  B) is more energy efficient
  C) consumes about the amount of energy
  D) is more energy efficient over very long distances
  E) it depends on the speed of the motion

Question 2

Currently the earliest bipedalism is associated with
 
  A) the African savanna
  B) an aquatic environment
  C) lakeside zones
  D) a wooded environment
  E) all of the above

[morrie123456]

Answer to Question 1

B

Answer to Question 2

D

[Yolanda]

Excellent

[AmberC1996]

Gracias!