Under which of the following circumstances might the nutrient levels in manure be tested? if it will be sold as fertilizer
if it is thought to contain pathogens
if a farmer or rancher wants to change the nutrients in his or her soil
if a CAFO’s Animal Waste Management Plan (AWMP) is being reevaluated

if a farmer or rancher wants to change the nutrients in his or her soil

Explanation:

The nutrients in the manure plays an important role in growth and development of the crops and they improve the fertility of the soil. Certain mineral elements present in the manure can change the pH of the soil which can affect the growth of the plants. Thus the mineral content of the manure should be tested thoroughly before changing the nutrients in the soil by providing the manure to the soil.

the way that the mass of carbon can be conserved through cellular respiration is through a process/law called the law of conservation of mass which even tho it undergoes a process, mass is not be destroyed or changed