Many harbors and marinas (like you see in Long Beach) used to be A. estuaries B. mangrove forests C. No answer text provided. D. rocky shores and headlands E. intertidal sandy beaches

E. Intertidal sandy beaches

Explanation:

Its also called the foreshore and seashore, in this area the water level of high and low tide remains in tidal ranges, the area also includes many species of life such as starfish sandy shoreline includes deposits of shells and gravel. Based on marin character consists of three zones low, middle, and high.