A food chain is a diagram that shows feeding interactions in an ecosystem through a single pathway.

The first trophic level always consists of

A food web contains many intersecting food chains.

Which level is known as the producer level?

Energy is recycled in a food chain.

The ecological pyramid depicts how biomass and energy increase from lower to higher trophic levels.

When the niche of a species at the top of the food chain impacts multiple species in preceding levels this is called

Select all that apply:

The wolves in Yellowstone National Park affect which of the following?

Anything that limits an organism's ability to survive in an ecosystem is referred to as a

Lichens attach to bare rock and eventually break the rock down into soil. For these reasons lichens are considered to be:

Both matter and energy are cycled between the biotic and abiotic systems on Earth.

The Nitrogen cycle relies on the work of

When Nitrates and nitrites cause an abundance of algae to grow ultimately causing a reduction of oxygen.

Bacteria convert the nitrogen in the atmosphere into_______.

CHONPS are