Question

Animals, including humans, take in O2, and breath out CO2 in respiration. Increasing the population leads to less O2 and more CO2 in the atmosphere. Is this a positive feedback loop, negative feedback loop, neither, or no answer provided?

Answer 1

Negative feedback loop

Step-by-step explanation:

For cellular respiration, almost all the living cells require O₂ (oxygen) and release CO₂ (carbon dioxide). The same CO₂ is used in the photosynthesis by chlorophyll-containing cells and O₂ is released in the process as a byproduct. Increasing population require more oxygen O₂ for the cellular respiration But reducing the number of plants due to deforestation and urbanization, the concentration of CO₂ increasing in the atmosphere.

Thus increasing the population leads to less O₂ and more CO₂ in the atmosphere is a negative feedback loop.