Question

scientists learned that some tropical trees grew more slowly in warm years than they did during cooler years. they also learned that plant respiration could increase at higher temperatures. these findings are most likely to be of concern to a scientist researching and monitoring - the level of carbon dioxide in the atmosphere the concentration of ozone in the atmosphere the number of species in a tropical rainforest the amount of pollutants in rainforest soils

Explanation:

Tropical trees growing slower in warm years and increased plant respiration at higher temperatures can affect carbon - dioxide levels. Slower - growing trees take in less carbon dioxide for photosynthesis, and increased respiration releases more carbon dioxide. This directly relates to the level of carbon dioxide in the atmosphere.

Answer:

the level of carbon dioxide in the atmosphere