The transition from brachiation to knuckle-walking occurred ...

[Garrulous]

The transition from brachiation to knuckle-walking occurred because __________.
 
  a. drying and cooling caused vast forests to break up into smaller areas
  b. apes shifted to terrestrial food sources
  c. the body size of great apes made brachiation impossible
  d. brachiation proved to be an inefficient form of locomotion

Question 2

The divergence of apes and monkeys seems to be based on __________.
 
  a. differences in diet
  b. the shift to terrestrial locomotion by the ape line
  c. differences in the social composition of monkey and ape groups
  d. changes in the cranial anatomy of the ape line

[hugthug12]

Answer to Question 1

Correct Answer: a

Answer to Question 2

Correct Answer: a

[Garrulous]

TYSM

[JaynaD87]

Thanks for the timely response, appreciate it