Question

in research stations around the world, such as the mauna loa observatory in hawaii, scientists measure the amount of co₂ in earths atmosphere. for many years, scientists have observed that the amount of co₂ in earths atmosphere rises and falls at different times of the year. this happens mainly because the amount of photosynthesis taking place on earth changes with the seasons. the majority of earths trees are located in the northern hemisphere and most of them grow much more slowly in december, january, and february. complete the sentences. when its winter in the northern hemisphere, the majority of earths trees grow much more quickly. there is photosynthesis happening during these months. so, the amount of co₂ in earths atmosphere .

Explanation:

The text states that in December, January, and February (winter in the northern hemisphere), most trees grow more slowly. Since photosynthesis is related to tree growth (trees use CO₂ in photosynthesis), less growth means less photosynthesis. And less photosynthesis (which consumes CO₂) would lead to an increase in CO₂ in the atmosphere.

Answer:

less; rises