The boundary where fresh water feeds into salt water is called a

The boundary where fresh water feeds into salt water is called an estuary. Estuaries and the wetlands surrounding them are bodies of water that are commonly seen where rivers meet the sea. Estuaries are home to different animal groups and distinctive plants that have adapted to salty water, which is a combination of fresh water draining from the land and salty seawater. Estuaries are among the most productive ecosystems in the world. A lot of animals depend on estuaries for migration stopovers, places to breed, and food.

b tumor cells have a cell wall instead of a membrane

explanation:

tumor cells different from normal cells because tumor cells have a cell wall instead of a membrane.

straight probes are used primarily for measuring flow as it is approaching the test area. its geometry allows the probe to be mounted so that it is in the direct line of airflow.