Using livestock as an energy source was helpful because the work ...

[Destiiny22]

Using livestock as an energy source was helpful because the work the animals did replaced many human
  laborers. Whereas tilling an acre would take one human ____ hours, the same work could now be done using
  livestock in ____ hours.

 
 

a. 160; 40
  b. 160; 20
  c. 140; 60
  d. 140; 20

Question 2

A physical anthropologist studies the:
 
 

a. process of continental drift
  b. development of human beings
  c. nature of heat and combustion
  d. way water is used to generate electricity

[kishoreddi]

Answer to Question 1

A

Answer to Question 2

B

[Destiiny22]

Great answer, keep it coming

[raili21]

TYSM