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For nutrients to cycle within an ecosystem, the ecosystem must have, at a minimum:

A. producers
B. producers and decomposers
C. producers, primary consumers, and decomposers
D. producers, primary consumers, secondary consumers, and decomposers

Which term includes all of the others?

A. heterotrophs
B. herbivores
C. carnivores
D. primary consumers

Which statement is TRUE about this simple food chain (arrows point toward the next trophic level)?

photosynthetic phytoplankton → zooplankton → fish → seals → polar bears

A. Polar bear populations are larger than seal populations.
B. Seal meat provides more food for top predators than fish.
C. Seal populations are larger than fish populations.
D. Fish provide more food for top predators than seal meat.

Answer :

For nutrients to cycle within an ecosystem, the ecosystem must have producers, primary consumers, secondary consumers, and decomposers.

In order for nutrients to cycle within an ecosystem, various organisms play crucial roles. Producers, such as photosynthetic phytoplankton in aquatic ecosystems or plants on land, are the foundation of the food chain. They convert sunlight and inorganic substances into organic matter through photosynthesis, thereby providing energy to the ecosystem.

Primary consumers, also known as herbivores, feed directly on the producers. They consume plant material and obtain energy from it. These primary consumers serve as a link between producers and higher-level consumers in the food chain.

Secondary consumers, which include carnivores, prey upon the primary consumers. They obtain energy by consuming herbivores or other secondary consumers. They play an important role in regulating population sizes and energy flow within the ecosystem.

Decomposers are crucial for breaking down dead organisms and waste materials, returning nutrients back to the ecosystem. They include bacteria, fungi, and other microorganisms that break down organic matter into simpler forms that can be recycled by producers.

Therefore, the term that includes all the others is "producers, primary consumers, secondary consumers, and decomposers." Each of these components plays a vital role in nutrient cycling and energy flow within an ecosystem.

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Rewritten by : Jeany