| A | B |
|---|
| Coral Reef | A marine ecosystem |
| benthos | bottom-dwelling organisms |
| nekton | free-swimming organisms |
| pond | freshwater ecosystem |
| barnacle | an organism that anchors itself to rocks |
| littoral zone | A lake zone near the shore and nutrient-rich |
| eutrophic lake | A lake that has a large amount of plant growth due to nutrients |
| zooplankton | mocroscopic animal organisms |
| estuary | a coastal area where fresh water from rivers mixes with salt water from the ocean |
| Flat, poorly drained land | Where swamps are commonly found |
| phytoplankton | Type of plankton that produces most of the food in an aquatic ecosystem |
| mangrove swamps | Marine ecosystem dominated by stilt type roots |
