Final answer:
Salt marshes support animal life through adaptations in halophytic plants and behavioral adaptations in animals.
Step-by-step explanation:
Salt marshes support animal life through a variety of adaptations. Many estuarine plant species, called halophytes, can tolerate salty conditions. They have filters in their roots that remove salt from the water and some are able to pump oxygen into their roots. Animals like mussels and clams have developed behavioral adaptations to function in the changing environment of salt marshes. They switch from aerobic respiration to anaerobic respiration when exposed to low salinity, and return to aerobic respiration when salinity and oxygen levels increase.