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