Describe how excessive algae growth can occur in a freshwater ecosystem, and explain why it is a problem
What will be an ideal response?
Such algae growth is caused by an excess of nutrients (especially nitrogen and/or phosphorus) in the waterway. As the algae die off, they provide organic material for decomposing bacteria. Because the bacteria need oxygen, the increased bacterial activity drives down levels of dissolved oxygen. Oxygen levels can drop too low to support fish and shellfish that require oxygen, leading to a loss of biodiversity and dramatic changes in aquatic ecosystems.
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The wealthiest single institution in the world is the Catholic Church
Indicate whether this statement is true or false.
The transition from single to multicelled organisms may have started with cell colonies. Indicate whether the statement is true or false
Which of the following is true of all strong electrolytes?
A) They are all ionic compounds. B) They all dissociate completely. C) both a and b D) neither a nor b
Which of the following statements is true?
A. Volcanoes are more widespread than earthquakes or high mountains. B. Earthquakes are more widespread than volcanoes or high mountains. C. High mountains are more widespread than volcanoes or earthquakes.