Which food is among the three foods that make up half of the calories consumed by humans? 

A)  fish 
B)  wheat 
C)  beef 
D)  soybean

What is the name of the topsoil horizon? 

A)  A horizon 
B)  B horizon 
C)  C horizon 
D)  O horizon

What is geographic isolation least likely to give rise to? 

A)  convergent evolution 
B)  speciation 
C)  divergent evolution 
D)  reproductive isolation

Which of the following is the best definition of science? 

A)  Science is a collection of facts determined by scientific methods. 
B)  Science studies the past to predict the future. 
C)  Science attempts to discover order in nature to interpret the past. 
D)  Science uses data to formulate scientific laws that become the basis for making predictions.