The correct answer is: B. Ecosystem of flowing water
A lotic ecosystem is a type of aquatic ecosystem that is characterized by flowing water. This type of ecosystem can be found in rivers, streams, and creeks. Lotic ecosystems are home to a variety of plants and animals that have adapted to the fast-moving water.
Option A is incorrect because a static water system is an ecosystem that does not have any moving water. This type of ecosystem can be found in lakes, ponds, and wetlands. Static water systems are home to a variety of plants and animals that have adapted to the still water.
Option C is incorrect because an estuary is a type of ecosystem that is found where freshwater meets saltwater. Estuaries are home to a variety of plants and animals that have adapted to the brackish water.
Option D is incorrect because a deep marine water system is a type of ecosystem that is found in the deep ocean. Deep marine water systems are home to a variety of plants and animals that have adapted to the low-light and high-pressure environment.