Before tools were invented, humans used _____.

Before tools were invented, humans used _____.
 
  a. rocks c. their hands
  b. flint d. all of the above

Question 2

One distinction between organic and inorganic fertilizers is that organic fertilizers contain:
 
  a. carbon c. potassium
  b. nitrogen d. lime

Question 3

Identify two problems that animals would have if left to roam freely.
 
  What will be an ideal response?

Question 4

Which of the following is an index that rates soils for intensive agricultural production on a 0 to 100-value scale?
 
  a. Crop Agricultural Index c. Crop Parameter Index
  b. Crop Productivity Index d. Crop Suitability Index

Question 5

In relation to treatment of animals, what three areas does the National Cattlemen's Association and the National Pork Producers Council's creed talk about?
 
  What will be an ideal response?