Which description fits a salt-marsh ecosystem? 1.a swampy area flooded by tides and freshwater runoff and populated by mangrove trees

2.an ocean ecosystem with shallow waters that supports populations of coral and many fish species

3.a swampy area flooded by tides and freshwater runoff and populated by grasses and other low-growing plants

4.a body of water where fresh water mixes with sea water that supports aquatic plant beds, where many fish lay their eggs