Answer:
Hormones, Cell receptor and glands
Answer: Convection
Explanation: Cold water sinks because it is more dense than warm water.
Warm water rises because it is less dense than cold water.
The answer would be combined statistical area. This is made of metropolitan and micropolitan statistical area which would be located in the United States as well as Puerto Rico that demonstrate both economic as well as social linkage.Hope this is the right answer.
They're called anastomoses