Which of the following is a biotic factor in the prairie ecosystem?

• sunlight
• water
• grass
• soil

The place where an organism lives and that provides the things the organism needs is called its

• habitat.
• population.
• community.
• species.

The smallest unit of ecological organization is a single

• ecosystem.
• organism.
• community.
• population.

An organism's habitat must provide all of the following EXCEPT

• water.
• food.
• shelter.
• predators.

The nonliving parts of an ecosystem are called

• organisms.
• populations.
• abiotic factors.
• biotic factors.

All the different populations that live together in an area make up a(n)

• community.
• ecosystem.
• organism.
• species.

Which is the correct levels of the ecosystem in order from smallest to the largest?

• population, community, ecosystem, organism
• ecosystem, community, population, organism
• community,population, organism, ecosystem
• organism, population, community, ecosystem

What is an example of a population?

• All the insects in the rainforest.
• All the trees in a forest.
• All the pigeons in New York City.
• All the plants in the Atlanta Botanical Gardens.