Which of the following is not an environmental function of wetlands?
Estuaries are very productive ecosystems because they receive fresh nutrients from
What causes most coastal pollution in the United States?
Swamps are commonly found on
The majority of marine organisms are found in
As they flow down a mountain to flatter ground, rivers generally become
Which of the following statements is not correct?
Threats to ocean ecosystems are
The types of organisms found in a pond or lake depend on
In the _____ zone, life is diverse and abundant.
In the _____ zone, the water is cool and dark.
What mainly distinguishes nekton from benthos?
Which organism produces most of the food in an aquatic ecosystem?
The arrangement of organisms in the open ocean is determined by the
Which of the following is not characteristic of wetlands?
An estuary functions as a mineral trap due to
Coral reefs are intricately shaped rocklike structures that are formed as a result of
What are the two main types of freshwater wetlands?
Which of the following is not characteristic of salt marshes and mangrove swamps?
Which ecosystem has the highest level of salinity?
Which of the following is a threat to coral reefs?
Why doesn’t photosynthesis occur in deep ocean water?
Fish are a type of _____, or free-swimming, organisms.
Marshes are dominated by ________ plants while swamps contain mainly ________ plants.