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

Producers...

• use carbon dioxide and release oxygen.

• include plants, algae, and phytoplankton.

• make their own food, rather than eating other living things.

• all of the above

Decomposers...

break down waste and dead material into nutrients for plants.

• are all microscopic (can only be seen under a microscope).

• create nutrients out of the air that help plants grow.

• break down waste and dead material into nutrients for plants.

What is taken in by plants, consumed by animals, and then released by decomposers?

• oxygen

• helium

• carbon

Living things in a pond all have a role to play. They are part of a system called

• an environment

• an ecosystem

• a diversity system

If a pond has a lot of decomposers, what else will it need?

• fish

• consumers

• producers

Why would it be helpful to have plants in a pond? Plants will...

• release oxygen in the water.

• make more carbon dioxide for the fish.

• filter the water and make it cleaner for the fish.

When the stuff at the bottom of the pond is broken down, what happens?

• There will be too much carbon dioxide and the fish can’t breath

• Micronutrients are released into the pond.

• The water will become too dirty and the fish will be sick.

The bottom of a pond is usually covered with

• pond sludge

• pond mud

• pond muck

Plants take in carbon dioxide, but decomposers and ____________ release carbon dioxide.

• consumers

• producers

• fish

A(n) ______________________ includes all the producers, consumers, and decomposers in an environment.

• environment

• fish tank

• ecosystem