6 Written Questions

1. The salt content in the water
2. one-celled plants that begins the food chains.
3. the second on the food chain.
4. organisms that live on or near the bottom. This group includes most mollusks, segmented worms, crustaceans, and flatfishes.
5. free-swimming organisms such as fishes, porpoises, and some crabs
6. This is a decayed plant material such as spartina, or chord grass, found in salt marshes.

5 Multiple Choice Questions

1. animals that eat plants.
   1. Secondary Consumers
   2. Positive Estuary
   3. Primary Consumers
   4. Producers
2. The estuary, its shoreline, bottom, mud flats, salt marshes, river mouth, plants, and animals make up this.
   1. Nekton
   2. Estuary
   3. Plankton
   4. Estuarine Zone
3. In this estuary more fresh water evaporates than enters.
   1. Estuary
   2. Positive Estuary
   3. Negative Estuary
   4. Neutral Estuary
4. A decayed plant material; detritus
   1. Nekton
   2. Spartina
   3. Plankton
   4. Salinity
5. green plants that "lock up" the sun's energy in their tissues through the process of photosynthesis.
   1. Estuary
   2. Detritus
   3. Producers
   4. Plankton

5 True/False Questions

1. Estuary → free-swimming organisms such as fishes, porpoises, and some crabs

   True        False

2. Plankton → floating organisms and weak swimmers. Most plankton are tiny plants and animals like diatoms, protozoans, and corepods, but large floating organisms like jellyfish are also considered plankton.

   True        False

3. Neutral Estuary → In this estuary evaporation and entering are about that same.

   True        False

4. Positive Estuary → In this estuary more fresh water evaporates than enters.

   True        False

5. Secondary Consumers → animals such as shrimp and small fish that eat zooplankton

   True        False