What is the primary source of energy for almost all ecosystems?

• Sunlight

• Water

• Oxygen

• Carbon dioxide

How does matter move in an ecosystem?

• In a cycle

• In one direction

• Randomly

• It doesn't move

What is a food chain?

• A model showing feeding relationships between organisms

• A model showing energy flow in an ecosystem

• A model showing the cycle of matter

• A model showing the water cycle

What is the role of decomposers in an ecosystem?

• Recycle matter

• Produce energy

• Consume producers

• Store energy

How is energy lost in an ecosystem?

• As heat

• As light

• As sound

• As matter

What does an energy pyramid show?

• The amount of energy at each level of a food chain

• The cycle of matter

• The water cycle

• The oxygen cycle

What is a food web?

• A model showing all the different food chains in an ecosystem

• A model showing the cycle of matter

• A model showing energy flow

• A model showing the water cycle

What is the first stage consumer in a food chain?

• An organism that eats producers

• An organism that eats decomposers

• An organism that eats other consumers

• An organism that produces its own food

How do producers obtain energy?

• From sunlight

• From consuming other organisms

• From decomposing matter

• From absorbing heat

What happens to energy as it moves through a food chain?

• It decreases

• It increases

• It remains constant

• It cycles back