_______ removes carbon from the atmosphere.
A: Photosynthesis
B: Cellular Respiration
C: Burning fossil fuels
A: Photosynthesis
What is the last stage of eutrophication when all the oxygen has been removed from the water?
A. Dead Hole
B. Corridor of Death
C. Dead Zone
C. Dead Zone
A food web shows ---
A: All of the ways that energy could be passed in an ecosystem.
B: the living and nonliving things in an environment
C: how algae blooms form
A: All of the ways that energy could be passed in an ecosystem.
In the picture below, the ___________ contains the most energy.
A: The top level (lion)
B: The middle level (giraffes)
C: The bottom level (plants)
C: The bottom level (plants)
Dissolved oxygen levels in the Bay are higher in January than August because ______________.
A: cold water can hold more dissolved oxygen.
B: warm water can hold more dissolved oxygen.
C: there is more sunlight in the winter months.
A: cold water can hold more dissolved oxygen.
Too much algae on lakes and ponds starts the process of ---
A: climate change
B: symbiosis
C: eutrophication
C: eutrophication

Which of the organisms in the food web above are the primary consumers?
A: 7 only
B: 5 and 6 only
C: 2, 3, and 4 only
C: 2, 3, and 4 only
In the picture below, the giraffes make up a(an) ________________________ .
A: Ecosystem
B: Family
C: Population
C: Population
Animals get the Nitrogen they need by _____________.
A. Breathing the Air
B. Eating plants
C. Using soil
B. Eating Plants
Algae blooms can cover the surface of the water. When this happens, sunlight cannot get to underwater plants. What effect does this have on the pond?
A. There is no effect on the pond's plants and animals.
B. The amount of consumers goes up .
C. Other plants and animals die from low oxygen levels in the water.
C. Other plants and animals die from low oxygen levels in the water.

Which of these organisms is the MOST important?
A: Mice
B: Frogs
C: Green plants
C: Green plants
During the daytime when the sun is out, dissolved oxygen (D.O.) levels will ____________?
A: increase
B: decrease
C: stay the same
A: increase
Oxygen and carbon dioxide are cycled in the environment. Which 2 process allow this to happen?
A. Fermentation and Oxidation
B. Precipitation and Condensation
C. Photosynthesis and Cellular Respiration
C. Photosynthesis and Cellular Respiration
How do nitrogen and phosphorus get into the Chesapeake Bay?
A. Surface Runoff
B. Animals
C. Plants
What is Surface Runoff

The ______________ population would probably increase (go up) if the snake population decreased (went down)?
A: Human
B: Mayfly
C: Frog
C: Frog
How do nitrogen and phosphorus get into the Chesapeake Bay?
A: Rain
B: Surface runoff
C: Animals
B: Surface runoff
Which of the following does NOT add carbon dioxide to the atmosphere?
A. Burning fossil fuels
B. Photosynthesis
C. Cellular Respiration
B. Photosynthesis
___________ has the greatest negative effect on the community of organisms living in a pond.
A. heavy rainfall
B. A tree falling into the pond
C. A large amount of algae over the pond
C. A large amount of algae over the pond

In this food web, the _____ has the greatest number of food sources (most things to eat).
A: hawk
B: grass
C: mouse
A: hawk
Nitrogen is needed for ______________.
A: making proteins
B: the Water Cycle
C: making Bacteria
A: making proteins