Understanding human evolution, unlike that of other species, is ...

[stevenposner]

Understanding human evolution, unlike that of other species, is particularly complex because of:
 
  a. the incomplete fossil record
 b. the rapid rate of decomposition among mammals
  c. the presence of culture
 d. the frequent migration associated with our species

Question 2

Scientists have found evidence of the earliest dental drilling to relieve pain as old as:
 
  a. 12,000 years ago.
  b. 9,000 years ago.
  c. 5,000 years ago.
  d. 2,500 years ago.
  e. 1,300 years ago.

[ecabral0]

Answer to Question 1

c

Answer to Question 2

b

[stevenposner]

Thank you!

[ecabral0]

Always glad to help...