Topic Test Answers

Where is oxygen content in a river or stream likely to be highest?a.the sourceb.the mouth c.the middle portiond.none of the above

Which of the following is not true of marshes, swamps, and bogs? a. They can be seasonal or permanent. b. They have very little groundwater. c. They can be very important to migrating animals. d. They are considered the most biodiverse ecosystems. Please select the best answer from the choices provided

Sewage is the most common form of pollution in rivers and streams.

Halophytes can be found in salt marshes.

What contributes to the high level of biodiversity found in wetlands?a.the large amount of available organic matter to organisms that are food for larger organismsb.the amount of available water for organism usec.the high nutrient availabilityd.all of the above