Ecosystems Review

Which organism is the producer in this food web?

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Many tourists and locals have been fishing in the same spot in this lake for a long period of time. How will the organisms in this food web most likely be affected if this fishing continues?

• The frog population will have fewer dragonflies to eat.

• The dragonfly population will have more beetles to eat.

• The pelican population will have less herring to eat.

• The mayfly population will have less algae to eat.

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A disease reduces the number of young salmon in a river. Which populations will MOST likely increase as a result?

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Which effect will an increase in sea urchins most likely have on this food web?

• a decrease in the number of sea otters

• a decrease in the amount of seaweed

• a decrease in the amount of sunlight

• a decrease in the number of parrotfish

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Changing ocean temperatures have led to a large decrease in the number of horseshoe crabs. Which effect will most likely occur next?

• The diamondback turtle and grackle populations will decrease.

• The striped bass and plankton populations will decrease.

• The razor clam population will increase.

• The sanderling population will increase.

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What is the source of energy for the cricket?

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Oscar placed a grasshopper in the terrarium and then put a lid on the jar. From what source will the grasshopper receive enough oxygen to survive?

• water

• plants

• rocks

• soil

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​ ​ (a)   is the gas people inhale through respiration. (b)   is the gas people exhale as a waste product of respiration.

• Oxygen
• Carbon dioxide
• Water
• Nitrogen

Which organism living in the pond uses the energy from sunlight to make food?

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The number of stonefly nymphs in a large stream increased over the last year. How will this most likely affect this food web?

• The brook trout population will increase, and the fly larva will decrease.

• The fly larva population will increase, and mayfly nymph population will decrease.

• The kingfisher population will decrease, and the brook trout population will increase.

• The mayfly nymph population will decrease, and the algae population will increase.

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