Organisms and Populations in an Ecosystem Depend on and May Compete

Living things depend on many different _________ in order to survive.

• resources
• environments
• ecosystems
• interactions

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Environments include both _____ and _____ things.

• resources; factors
• air; water
• living; nonliving
• buildings; animals

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For populations to continue to survive, some organisms in the population must _________.

• grow
• reproduce
• eat
• die

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Characteristics such as height, hair color, and eye color are ________ factors.

• environmental
• ecosystem
• population
• genetic

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Ecosystems depend on organisms to ________ with each other to maintain stability.

• interact
• build
• eat
• grow

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Organisms are the ________ things in an ecosystem.

• factors
• nonliving
• resources
• living

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Air, water, and sunlight are all ________ components of an ecosystem.

• factors
• nonliving
• man-made
• living

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Wildlife biologists study _____.

• populations in ecosystems
• only wild animals
• only plants
• farm animals

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Plants compete for air, water, ________ within ecosystems.

• space, and sound
• sunlight, and wind
• space, and sunlight

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An invasive species is a plant or animal that is ________ to an ecosystem.

• not native
• just visiting
• beneficial
• not friendly

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