Question: A student wants to estimate the number of dandelion plants growing in a field. He counts the number of plants in a 5 square meter section of the field. What other information should he obtain to make his estimate?

  Options: 
 A. the total area of the field
 B. average rainfall in the area
 C. all the organisms living in the field
 D. energy and nutrient requirements of dandelions
Answer: A