Question

by measuring atmospheric co₂ concentrations, scientists can analyze seasonal and historic trends in the carbon cycle as it pertains to living things. the graph shows the amount of co₂ in the atmosphere between 1958 and 2025. long - term changes in atmospheric co₂ concentration source data: noaa global monitoring laboratory, measured at the mauna loa observatory. determine whether each statement is true or false. the global atmospheric co₂ concentration typically decreases from may to october, when more plants are growing in the northern hemisphere. the global atmospheric co₂ concentration in the 2020s was lower than it had been throughout much of the previous sixty years. analyzing atmospheric co₂ levels over many decades reveals a similar trend to atmospheric co₂ levels over any given year. seasonal fluctuations in atmospheric co₂ levels are not influenced by land plant photosynthesis.

Explanation:

Step1: Analyze first statement

In the Northern Hemisphere, from May - October, more plants are growing. Plants absorb CO₂ during photosynthesis, so global atmospheric CO₂ concentration typically decreases. So the first statement is True.

Step2: Analyze second statement

Looking at the graph, the CO₂ concentration in the 2020s is higher than many previous years in the 60 - year period shown. So the second statement is False.

Step3: Analyze third statement

Both long - term (decades) and short - term (yearly) trends show an overall increase with seasonal fluctuations. So the third statement is True.

Step4: Analyze fourth statement

Seasonal fluctuations are mainly due to land plant photosynthesis. In growing seasons, plants absorb CO₂ and in non - growing seasons, CO₂ is released back. So the fourth statement is False.

Answer:

1. True
2. False
3. True
4. False