Which one of the following statements is accurate?
a. the green revolution was instrumental in the increase of the world's food supply.
b. agriculture has been challenged by the use of selective breeding.
c. wheat, corn, soybeans, and cabbage are the main four plants responsible for providing food to people in the world.
d. gymnosperms provide humans with the most food.

The green revolution was instrumental in the increase of the worlds food supply.

Explanation:

a=c and then d= c because of the band so you get ac/dc and you add them together you get sound waves

the rocks are classified by the geological process they are formed by. the three main groups of rocks are igneous, metamorphic, and sedimentary. minerals are not they are classified under the chemical classes they are in. these groups include silicates, sulfates and carbonates.