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Question: which of the following scenarios are examples of negative stabilizing...

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Which of the following scenarios are examples of negative stabilizing feedbacks? Select all that are true.

A. When blood sugar levels rise after eating a meal, the pancreas releases the hormone insulin, stimulating cells to take up sugar from the blood. When blood sugar levels drop, the pancreas releases another hormone to stop sugar uptake by cells.

B. A snowball rolling down a hill accumulates snow and becomes larger, which increases its speed, causing it to increase its size and speed even more.

C. Increasing air temperatures from global warming speed up the melting of glaciers, exposing darker rocks underneath the ice. The dark surfaces absorb more sunlight, causing further increases in temperature and accelerated glacier melting.

D. A dog pants as it lies in the hot summer sun, releasing excess body heat to the environment and lowering its body temperature to its stable state.

E. You invest $1,000 in a savings account and reinvest the 5% interest you earn. The interest makes the amount of money in the account larger, so it earns even more interest. After 20 years, the account contains more than $2,600 and is still growing.

F. A bull on the edge of a herd of cattle panics when it hears a loud noise and begins to run. Five nearby cattle sense the panic and also begin to run. This causes another 15 cattle to panic. Eventually, all 100 cattle in the herd panic and stampede.

The hypoxic zone in the Gulf of Mexico is not unique; at least 200 dead zones exist at estuaries and along seacoasts worldwide. These low-oxygen regions share many of the same causes, and they all have ecological and economic repercussions for ecosystems and people. Fortunately, we can pursue strategies to lessen the number, severity, and impacts of dead zones.

The following list includes examples of factors that contribute to the development of dead zones (the cause), the consequences that result from dead zones, and possible solutions. Which of the following are causes of dead zones? Select all that are true.

A. shifts in the marine food web

B. phosphorus from urban and suburban fertilizer runoff and eroded sediments

C. reduction of fertilizer use to decrease nutrient pollution from farms

E. policies to promote no-till agriculture

F. construction of wetlands to absorb nutrients

G. economic losses for fisheries

H. nitrogen runoff from agricultural fertilizers and manure

I. nutrients released from municipal and industrial wastewater

J. death of aquatic organisms that cannot escape

The atmosphere is an important reservoir (pool) in all the following cycles EXCEPT ________.

A. water

B. carbon

C. nitrogen

D. phosphorus

Which statement best describes the relationship between temperature and productivity of terrestrial biomes?

A. Warmer biomes tend to have higher productivity than colder biomes, given sufficient moisture.

B. There is no relationship between temperature and productivity in terrestrial biomes.

C. Colder biomes tend to have higher productivity than warmer biomes, given sufficient moisture.

D. Seasonal, moderate temperatures tend to promote the highest levels of productivity.

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