1-5 Why do you have to clean a fish tank but not a pond?

Which of the following best describes "algae"?

• Tiny living things in water that produce their own food, like plants do

• A type of gas that plants sometimes take in

• A living thing that eats other living things

• The air that surrounds a planet

What is the main function of a decomposer in an ecosystem?

• To produce their own food

• To break down dead living things

• To take up space in different forms

• To eat other living things

Which term refers to the process of carbon moving through living things and the environment?

• Carbon dioxide

• Carbon cycle

• Atmosphere

• Matter

Imagine you are building a pretend version of a fish tank to study how it works. What scientific term describes this pretend version?

• Model

• Cycle

• Fungus

• Consumer

If you observe a pond and notice that all the living things interact with each other and their environment, what is this group called?

• Atmosphere

• Ecosystem

• Matter

• Bacteria

What is a nutrient?

• A substance that living things need to grow and stay healthy

• A type of gas that animals use to breathe

• A tiny floating living thing in water

• A group of things that affect each other

Which word describes any living thing?

• Organism

• Producer

• System

• Oxygen

What is the main function of a producer in an ecosystem?

• To make its own food

• To breathe oxygen

• To float in water

• To affect other things in a group

How are phytoplankton different from algae?

• Phytoplankton are smaller than algae and produce their own food

• Phytoplankton are larger than algae and do not make food

• Phytoplankton live on land, algae live in water

• Phytoplankton are animals, algae are plants

Imagine you are designing a small pond system. Which of the following would you include to make sure it works as a system?

• A group of things that affect each other and function as a whole

• Only one type of plant

• Just water and rocks

• Only fish