Question

an experiment was conducted in a closed system for five days. the percent of oxygen and carbon dioxide was measured daily and recorded in the table.
what process most likely occurred that would explain the results?
options:

• aerobic respiration
• anaerobic respiration
• photosynthesis
• hypothesis

table:

	day 1	day 2	day 3	day 4	day 5
% o₂	25	40	50	60	75

Explanation:

Aerobic respiration consumes oxygen (\(O_2\)) and produces carbon dioxide (\(CO_2\)). As shown in the table, the percentage of \(O_2\) decreases while the percentage of \(CO_2\) increases over the five - day period. Photosynthesis would consume \(CO_2\) and produce \(O_2\), which is the opposite of the trend in the table. Anaerobic respiration does not consume \(O_2\) in the same way as aerobic respiration (and often has different end - products). Fermentation is a type of anaerobic process and also does not match the \(O_2\) consumption and \(CO_2\) production pattern here.

Answer:

Aerobic respiration.