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

Its gonna be answer B because wheat is needed for a lil bit of almost everything such as flour bread and other doughs, corn is use d as feed for meat animals, cows pigs and chickens and also as food for humans, also corn meal. soy beans are being used to credat a healthier (so they say) kind of alternative for meat it can also be used for making biofuels,and cabbage as food as well. hope this helps

They use the si unit, or metric system its all the same thing

Air enters through the nose (and sometimes the mouth), moves through the nasal cavity, the  pharynx, the  larynx, enters the  trachea, moves through the  bronchi  andbronchioles  till the alveoli.