The American grasslands are home to which types of animals? 

• elephants, lions, and zebras
• foxes, prairie dogs, and rabbits
• lizards, tortoises, and weasels
• wolves, deer, and bears

Which type of ecosystem has the greatest variation in temperature from its top to its bottom?

• lake
• pond
• ocean
• estuary

Which ecosystem contains the largest mammals?

• ocean
• pond
• river
• swamp

Which best describes what makes one ecosystem different from another?

• the amount of sunlight, rainfall, temperature, and species types
• the amount of animals, oxygen, plant life, and pollution
• the amount of carbon dioxide, oxygen, water, and soil
• the amount of soil, water, buildings, and humans

Which is most accurate in describing an estuary ecosystem?

• High salt levels keep the water clear of nutrients and proteins.
• Freshwater mixes with saltwater to provide a nutrient-rich environment.
• Animals and plants compete for food due to pollution from surrounding areas.
• Cold water mixes with saltwater to create a cooling effect that encourages growth.

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Which could be a challenge for a small animal living in a grassland ecosystem?

• The frozen ground is too hard to serve as shelter.
• The flat terrain makes it easy for predators to spot prey.
• The extreme temperatures require thick skin and heavy fur.
• The high amounts of precipitation create excess water resources.

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Which best describes a desert during the day?

• cold and wet
• cold and dry
• hot and wet
• hot and dry

Which best describes a lake ecosystem?

• contains only salt water
• contains only freshwater
• contains both freshwater and salt water

An ecologist is comparing two different ecosystems and creates the following list of similarities:  
*aquatic
*diverse fish life
*high salt concentration
*plentiful light at the water’s surface

Which two ecosystems was the ecologist most likely comparing?   

• ocean and lake
• estuary and ocean
• grassland and pond

Which statement best describes how ponds and lakes are similar?

• The temperature of the water increases as depth increases.
• Most organisms live in the deepest part of the bodies of water.
• More plant life is found in the shallow areas of lakes and ponds.

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