How can algal growth be a problem in a freshwater system?
What will be an ideal response?
Algae that grow too rapidly can cover the water's surface, harming the deeper-water plants that depend on sunlight for survival. As algae die off, they provide food for decomposing bacteria. Because bacterial decomposition of organic matter requires oxygen, the increased bacterial activity drives down levels of dissolved oxygen. These levels can drop too low to support fish and shellfish, leading to dramatic changes in aquatic ecosystems and loss of biodiversity Also, the increasing turbidity and anaerobic metabolism have a destructive effect on coastal marine communities, especially coral reefs, making these eutrophic systems unappealing to fishermen and recreational users.
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________ prescribed a series of ethical principles for daily life based on li meaning propriety,
A) Siddhartha Gautama B) Dalai Lama C) Lao-Zi D) Confucius E) Guru Nanak
Looking at Figure 11.4.4, which of the following countries had the highest steel production in 1980?
A) Argentina B) Russia C) China D) United States E) Brazil
Stewardship is based on the idea that nature exists for all species alike and our success depends on how well we manage the earth.
Answer the following statement true (T) or false (F)
The ozone layer is crucial for filtering out __________.
gamma radiation infrared radiation visible light ultraviolet radiation