Biodiversity/Succession REMEDIATION

What is a keystone species?

• a kind of organism that has been part of an ecosystem for a long time

• a species that is brought to a place by humans and becomes part of the local ecosystem

• a species that is critical for the overall health of an ecosystem

• an introduced species that has a negative impact on an ecosystem

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species that are native to and found only within a limited area

• endemic

• exotic

• endangered

• extinct

a species at risk, but not yet endangered

• endangered

• exotic

• endemic

• threatened

In what part of the world are the greatest number of extinctions occurring?

• in deserts

• in the Arctic

• in tropical rain forests

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How can humans best help an endangered species avoid extinction?

• they can feed the animals
• they can put the animals in a zoo
• they can protect the animal’s habitat
• they can take the animal to new habitats

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Define genetic diversity

• variation of genes within a species or population in a given area

• variety of ecosystems in a given area

• system made up of all the living and nonliving things in a given area

• disturbance in the environment conditions that cause genetic changes to occur in organisms

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Define ecosystem diversity

• variety of ecosystems in a given area

• variation of genes within a species or population in a given area

• variety of life in Earth's land, freshwater, and marine ecosystems

• changes to an ecosystem that affect how the parts of it interact

Tags

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A common type of succession that occurs where an event such as a forest fire has occurred

• common succession

• primary succession

• secondary succession

• Quaternary succession

What is the main difference between primary and secondary ecological succession?

• Primary begins WITHOUT soil; Secondary begins WITH soil

• Primary is the first state and secondary is the second stage

• Primary builds plant community; secondary builds animal community.

• Primary begins WITH soil; Secondary begins WITHOUT soil

Which natural occurrence describes an incident that may lead to a primary succession?

• Glaciers melt and leave exposed rock

• Plants die from drought and decompose

• Land is bulldozed and soil remains

• A volcanic eruption