Question

1) Carbon dioxide is returned to the atmosphere primarily by the
A) eruption of volcanoes.
B) respiration of consumers.
C) fallout from solar flares.
D) process of photosynthesis.

Answer 1

Carbon dioxide is primarily returned in the atmosphere through (letter b) respiration of consumers. Humans and animals are consumers (plants are producers) and are capable of exhaling carbon dioxide. Hope this helps.

Answer 2

B) respiration of consumers.

Carbon dioxide

• Carbon dioxide is an acidic, colorless gas with a density that is roughly $53\%$ that of dry air.
• A carbon atom is covalently doubly linked to two oxygen atoms in a carbon dioxide molecule.
• Carbon dioxide is mostly recycled to the atmosphere by B) consumer respiration.
• Humans and animals are carbon dioxide consumers (plants are carbon dioxide producers).

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