Question

reviewing main ideas

1. which of the following can decreas amount of carbon dioxide in the atmosphere?

a. a person running
b. planting trees in the park
c. driving to work
d. campfire

1. which of the following processes a responsible for the cycling of carbo through earth’s systems?

a. photosynthesis
b. cell respiration
c. decomposition
d. all of the above

Explanation:

Question 1

• Option a: A person running increases respiration, releasing more CO₂.
• Option b: Trees perform photosynthesis, absorbing CO₂, so planting trees decreases atmospheric CO₂.
• Option c: Driving burns fossil fuels, releasing CO₂.
• Option d: Campfire burns organic matter, releasing CO₂.

• Photosynthesis (a) takes in CO₂.
• Cell respiration (b) releases CO₂.
• Decomposition (c) releases CO₂ from dead organisms. All three processes are part of the carbon cycle.

Answer:

b. Planting trees in the park

Question 2