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1) parasites can kill their hosts

A. True
B. False

2) the addition or removal of a species causes a trophic Cascade
A. True
B. False

3) why are Marine scientists particularly concerned about parasites in the blue crab population
A. It is the only species impacted by parasites
B. Blue crabs are an important part of the regions economy
C. The blue crab is not as vulnerable to parasites as other species are
D. The parasites that impact the blue crab are deadly to the human population

4) why does it benefit an imperial shrimp to travel on a sea cucumber
A. The shrimp feeds on the sea cucumber as it rides
B. The shrimp could move to a new feeding ground
C. The sea cucumber is one of the shrimps predators
D. The sea cucumber carries parasites that the shrimp eat

5) how do species that fill the same niche as each other survive in ecosystems
A. One will eliminate the others
B. This does not happen in ecosystems
C. They adapt to fill slightly different niches
D. The ecosystem will adapt to support them

6) the lemming population cycle is
A. Generally 3 to 5 years
B. A unique event in nature
C. Limited to a cycle of 3 months
D. Related to seasonal births and deaths

7) why is parasitism a symbiotic relationship
A. It benefits both species involved
B. Neither species is harmed in this relationship
C. It is an example of interdependence among species
D. It allows more organisms to thrive in an ecosystem

8) the variations in the lemming population illustrate
A. The impact that population cycles have on predators
B. The ways in which a lack of food drives species to extinction
C. The benefits that generalist predators have over specific predators
D. How land animals have different population cycles than marine creatures

9) all of the following are problems after hurricanes EXCEPT
A. Turbulence
B. Colder water
C. Less sunlight
D. Mild currents

10) hurricanes can disrupt water up to how deep
A. 50 feet
B. 120 feet
C. 300 feet
D. 475 feet

11) the bottom layer of the food pyramid is generally the largest
A. True
B. False

12) when cod entered the baltic sea, which population dramatically increased
A. Herring
B. Zooplankton
C. Phytoplankton
D. Fish similar to cod

13) the relationship between the anemone and the boxer crab is an example of
A. Mimicry
B. Mutualism
C. Parasitism
D. Commensalism

14) which of the following is an example of an adaptation that allows similar species to live in the same environment
A. Desiccation is an issue for mussels but not for barnacles
B. Both mussels and barnacles live in the tidal ecosystems
C. Barnacles attach themselves to rocks or other fixtures of the landscape
D. Mussels are better equipped to live in the deep cracks of rocks than barnacles are

15) how do adaptations help species manage competition
A. They prevent overpopulation
B. They allow species to fill the same niche
C. They can create more space in the environment
D. They allow species to access different food sources

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