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Rabbits eat grass. Red foxes eat rabbits. How does this relationship help provide oxygen
and moisture that the animals need?
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The foxes keep the rabbits from eating all the grass
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What does the statement “All organisms in an ecosystem are interrelated.” mean?
- A change in one population affects the entire community.
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What could happen if the rabbit population in an ecosystem decreased significantly?
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Grasses could take over the space that other plants need.
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What helps keep an ecosystem in balance?
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What living things does the Eastern American chipmunk depend on to survive in the Great
Smoky Mountains?
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fungi and plants for food
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How is a healthy ecosystem like a seesaw?
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The resources in the environment are enough to meet the needs of the
populations in that environment.
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Mistletoe grows on a living tree. The mistletoe takes nutrients from the tree and harms the
tree. What is the niche of the mistletoe?
-
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When moss lives closely with an oak tree, how does the relationship benefit the tree?
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The oak tree is not harmed or helped by the relationship.
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What behavior helps wolves to compete successfully for food?
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What will probably happen to a chipmunk that competes successfully for a resource?
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The chipmunk will survive and reproduce.
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Some types of insects travel with army ants. These insects eat whatever scraps the army
ants leave behind. How are army ants affected by this relationship?
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The army ants are not affected by the other insects.
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In a lichen, fungi receive sugar, nutrients, and water from the algae. Fungi shield the algae
from too much sunlight and warm temperatures. What is this relationship an example of?
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Both organisms benefit from the relationship.
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What do you call the slow changes that take place as one community of organisms
changes to another over a very long time?
-
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What does it mean when a species is endangered?
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The species has become reduced and it is in danger of extinction.
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What is a benefit of a natural disaster such as a forest fire?
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Some pine cones open only when heated by fire.
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What does finding fossils of marine organisms in a desert region mean?
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It means that the desert region was once covered with shallow seas.
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What does it mean when a species becomes extinct?
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The entire species has died out and is gone forever.
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What are average temperature and winds over a long time examples of?
-
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Which of these events forces populations to leave an area rapidly because resources they
need are no longer available?
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floods, fires, or volcanic eruptions
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When is a species considered extinct?
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When all members of a species have died out.
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What do fossils tell about species from long ago?
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Fossils tell that life on Earth has not always been the way it is now.
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What conditions make a species endangered?
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The population is very small and is threatened.
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How did the Clean Water Act help waterways?
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made it illegal to put pollutants into water
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What are some examples of the ways in which people change environments to meet their
needs?
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People clear land to plant crops and build roads.
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Why was the national park system established?
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to preserve nature’s beauty, historic sights, and unique habitats
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What are the three steps for reclaiming mined land?
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Replace rock and soil, replant with crops or native trees and grasses, and submit
a plan before a mine is dug.
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How are humans different from other organisms when interacting with the environment?
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Humans change parts of the environment to meet their needs.
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How does pollution cause problems in water ecosystems?
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Pollutants affect organisms that live in or depend on clean water.
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How would you describe hazardous wastes?
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a way to get coal from the land
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