Question

post test: the interdependence of ecosystems
identify the four spheres involved in the carbon cycle.
geosphere hydrosphere biosphere atmosphere
a →
blank
b →
blank
c →
blank

Explanation:

• A: Label A points to plants/animals (living organisms) which are part of the biosphere, where photosynthesis/respiration occur.
• B: Label B points to fossil fuels stored underground, which is part of the geosphere (Earth's solid crust/rock layers).
• C: Label C points to atmospheric CO₂ emissions, which is part of the atmosphere (the layer of gases surrounding Earth).

Answer:

A → biosphere
B → geosphere
C → atmosphere
(Note: Label D, the ocean, corresponds to the remaining sphere: hydrosphere)