Which statement best describes the relationship between decomposers and producers (like plants) in the context of the carbon cycle?

Decomposers provide the carbon dioxide that producers need for photosynthesis.

Producers provide the complex sugars that decomposers need to start their life cycle.

Decomposers and producers are in direct competition for atmospheric oxygen.

Producers are the only source of organic matter for decomposers to break down.

An ecologist observes that the growth of plants in a sealed terrarium has slowed dramatically. A gas analysis reveals a significant drop in atmospheric carbon dioxide. Which component of this ecosystem is most likely failing to function properly?

The light source providing energy

The plants' ability to absorb water

The herbivores that consume the plants

They convert sunlight into chemical energy for the ecosystem.

They break down dead organic matter, releasing carbon dioxide that plants can then use.

They serve as the main food source for all primary consumers, such as herbivores.

They produce the majority of the oxygen that animals breathe through respiration.

The trees would grow much faster due to a lack of competition.

Dead organic material like leaves and animals would accumulate on the forest floor.

The amount of oxygen in the atmosphere would significantly increase.

The rate of photosynthesis would immediately double.

Creating a physical barrier that prevents carbon from escaping the ecosystem.

Converting atmospheric nitrogen into a form that plants can use.

Returning carbon from dead organisms back to the atmosphere for plants to use.

Ensuring that carnivores have enough herbivores to eat throughout the year.