CHANGES TO ECOSYSTEMS

Janice is studying the positive and negative impacts that humans have on ecosystems. She made a list of all the impacts she could think of but now needs to sort them.

Which statements refer to the negative impacts humans have on ecosystems? Choose THREE correct answers.

• Factories can pollute the atmosphere.
  

• Dumping waste can pollute the local water supply.
  

• Building highways can cut into natural land.
  

• Creating artificial reefs in the ocean can provide more habitat.

• Planting trees can create new habitats for animals.

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Which of the following is the best example of competition?

• 1. Bacteria in our stomachs gets energy from the food we eat while helping us digest it.

• 1. Goats and cows graze grass from the same small field.

• 1. A bear catches fish out of a river.

• 1. A bird builds a nest in a tree.

What effect would NOT occur in an ecosystem if humans cut down trees for resources?

• 1. Competition between birds for nesting sites would increase.

• 1. There would be less shelter for squirrels, birds, and other animals.

• 1. The number of plants would increase.

• 1. Animals that rely on trees for food would have fewer food sources,

     increasing competition.

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An individual life form is known as an _________

• ORGANISM

• SPECIES

• POPULATION

• COMMUNITY

Organisms that can breed and produce offspring that can also reproduce are

known as a __________

• ORGANISM

• SPECIES

• POPULATION

• COMMUNITY

A ____________________ is a group of all the individuals of the same species in an area.

• ORGANISM

• SPECIES

• POPULATION

• COMMUNITY

Populations of organisms of different species in an area are known as a

COMMUNITY

____________________.

• ORGANISM

• SPECIES

• POPULATION

• COMMUNITY

How could beavers building a dam cause an increase in fish population?  The dam -

• blocks a river and creates a large lake.

• forces many birds to leave the ecosystem.

• removes trees from around the river.

• causes predators to hunt more fish.

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Which statement correctly describes the impact of a natural disaster on an ecosystem?

• 1. Tornadoes cause magma to rise to the surface. As the lava cools, it forms new

     crust.

• 1. Hurricanes cause severe wind damage and extreme flooding as they make

     landfall along coastal regions.

• 1. Tsunamis cause a severe and abnormal lack of rainfall that impacts animals, crops, and other plant life.

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Why is it important to study natural disasters?

• 1. So we can completely stop a natural disaster from occurring.

• 1. So we can better understand their formations and effects on ecosystems and communities.

• 1. It is not important to study natural disasters.

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