The EPA sets national air-quality standards for common air pollutants. The graph shows the change in the concentrations of these pollutants over time.

Which conclusion do the data in the graph support?

A. Concentrations of all pollutants have increased.

B. Monitoring concentrations of pollutants is too expensive.

C. Monitoring concentrations of pollutants has been ineffective.

D. Concentrations of all pollutants have decreased.

i think it is true in my reasonment ..

a

explanation:

many plants naturally reproduce this way, but it can also be induced artificially. horticulturalists have developed asexual propagation techniques that use vegetative plant parts to replicate plants. success rates and difficulty of propagation vary greatly. monocotyledons typically lack a vascular cambium and therefore are harder to propagate.

answer: glucoamylase presented optimum activity at temperature of 55â°c, and, in the glycosidic bonds from the non-reducing ends of starch, resulting in the production of glucose. source and type of fermentation can affect the enzyme's properties

credit to kalahira

i believe it is "they are not used up by reactions" as the answer to your question, text me back if this is correct because i just learned this.