Keystone and Invasive species

What is a keystone species?

• A species that is critical to the survival of other species in an ecosystem

• A species that is unimportant in an ecosystem

• A species that is only found in marine ecosystems

• A species that is not formally recognized by scientists

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What is biodiversity?

• The variety of living species on Earth

• The process of overgrazing in grasslands

• The interaction between predators and prey

• The creation of wetlands by ecosystem engineers

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What is a keystone species?

• A species that helps to hold an ecosystem together

• A species that lives in or around rocks

• Keys and stones have nothing to do with ecology

• A keystone isn't a living thing, it's just a stone

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Organisms that create their own energy from sunlight or chemicals

• Herbivore
• Omnivore
• Autotroph
• Heterotroph 

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Why do we sometimes use a food pyramid to illustrate feeding relationships?

• To change things up a bit
• Pyramids show you need a lot more producers than consumers
• To show you need more consumers than decomposers
• Pyramids are neat

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What is an invasive species?

• A species that does not belong in a certain ecosystem

• A species that is becoming extinct

• A species that keeps an ecosystem balanced

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Two or more species that engage in mutually beneficial interactions.

• mutualists

• engineers

• invasives

• predators

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Where an organism lives

• habitat
• niche 
• heterotrogh
• biosphere

In this food chain, what will happen if the frogs become extinct?

• The snakes will increase.
• The grasshoppers will decrease.
• The eagles will remain the same.
• The grasshoppers will increase.

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A food chain shows the transfer of ___ from one organism to another. 

• matter
• consumers
• energy
• habitat

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