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          An earthworm farmer wanted to grow three species of earthworms, but earthworms can be very picky about the temperature, moisture, and pH balance of their soil. This graph shows the range of soil conditions preferred by three species of earthworms in an earthworm soil bed. 
          Which of these conditions would cause the most competition for the resources among the three species of earthworms?

• Very warm soil, ph of 6, and dry.
• Very cold soil, pH of 7, and high moisture.
• Moderate temperature, pH of 6.5, and moderate moisture.
• Moderate temperature, pH of 7.0, and high moisture.

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Bromeliads are small plants that grow attached to the sides of large trees high above the ground in warm, damp and densely crowded tropical rainforests. Bromeliads do this because they are in competition with other plants for -

• soil.
• heat.
• light.
• water.

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Which is NOT an abiotic factor:

• Soil
• Air
• Bacteria
• Water

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If the grasshopper were to be removed completely from the food web, what organism would be most affected?

• The squirrel

• The shrew

• The deer

• The rabbit

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Temperature, light, air, water, and climate are all __________ factors of the environment. 

• biotic
• abiotic

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Animals from two different species utilize the same source of nutrition in one area. It is most accurate to say that the animals…

• will learn to get along
• will compete for food
• will die because there will not be enough food for both of them
• will learn to eat different foods

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Which organism do the owl and the weasel compete for in the food web?

• Hawk
• Spider
• Grasshopper
• Shrew

If an invasive plant grows in a forest, then:

• sunlight is more abundant.
• native plant growth decreases.
• windy days increase.

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• Produce large amounts of food
• Absorb large amounts of water
• Store excess gases
• Filter excess salt

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• Mayflies that were previously abundant are no longer present in the stream
• Stone flies and midges thrive and compete for the same food source
• Large numbers of crayfish are suddenly dead
• Riffle beetles have become more abundant in the stream

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