| A | B |
|---|
| What are the four abiotic factors used to classify aquatic ecosystems? | depth, flow, temperature, water chemistry |
| Streams and rivers are examples of _________ ecosystems. | flowing-water ecosystems |
| Lakes and ponds are examples of ______ ecosystems. | standing-water ecosystems |
| Give two examples of standing-water ecosystems. | Lakes and ponds |
| Give two examples of flowing-water ecosystems. | Streams and rivers |
| Where water flows quickly, there is a lot of dissolved _______ but little ____. | oxygen, plant life |
| _____ are free-floating organisms that live in both fresh and saltwater (usually unicellular). | Plankton, 
|
| Plankton that are autotrophs (producers) are called ____ and they form the base of most aquatic food chains. | phytoplankton,
|
| Plankton that are heterotrophs (consumers) are called _____. | zooplankton,
|
| An ecosystem in which water either covers the soil or is present at or near the surface of the soil for at least part of the year is called a(n) ______. | wetland |
| _________ are formed where a river meets the sea. | Estuaries |
| ______ water is a mixture of fresh and saltwater. | Brackish |
| ________ is partially decomposed organic matter. It washes into estuaries to form the base of the estuary food chain. | Detritus |
| _______ are estuaries that are dominated by grasses. | Salt marshes |
| ________ swamps are coastal areas dominated by salt-tolerant trees with big roots that trap sediments and prevent erosion | Mangrove,  |
| What type of coastal ecosystem is shown below?, | A mangrove swamp. Notice the huge root system coming off the mangrove trees., |
| The _______ zone is the layer of the ocean that light penetrates | photic |
| The _______ zone is the layer of the ocean that light cannot penetrate. | aphotic (pronounced "A-fotic") |
| No autotrophs can grow in the aphotic zone because without light, _________ is impossible. | photosynthesis |
| The part of the ocean that lies beyond the continental shelf is called the ________. | open ocean |
| _______ is the zone between the low tide mark and the edge of the continental shelf. | The coastal ocean |
What type of coastal ecosystem is this seal swimming around in?,  | kelp forest, |
What type of coastal ecosystem is pictured below?,  | Coral reef, |
| The _______ zone refers to the sea floor. | benthic |
| Organisms that live on, in, or attached to the sea floor are referred to as _____. | benthos |
