Diesel engines are more fuel efficient than gasoline engines. (True or false?)

Diesel engines are more fuel efficient than gasoline engines.
 
  Indicate whether the statement is true or false

Question 2

The world today produces over three times the milk with half the number of cows.
 
  Indicate whether the statement is true or false

Question 3

A plant can be classified as a weed if it:
 
  a. causes economic loss to a crop c. is detrimental to wildlife or ecosystems
  b. is harmful to humans and livestock d. All answers are correct.

Question 4

Most Brazilian ethanol is produced from large crops of sugarcane.
 
  Indicate whether the statement is true or false

Question 5

Animals raised in disease-free environments cost less and pose less risk.
 
  Indicate whether the statement is true or false

Question 6

The main concern with atrazine is leaching and accumulation in surface and groundwater.
 
  Indicate whether the statement is true or false