Chambers
It is called speciation.
The area of land drained by a river and its tributaries is called a drainage basin. They are separated from each other by an area of higher ground called a watershed or divide. This watershed determines the direction in which water flows.
Drainage basins are separated from each other by an area of higher ground called a divide. This divide helps to direct water within a specific drainage basin, preventing water from flowing into neighboring basins.
The oceans are divided into distinct regions called basins, each with its own boundaries defined by the continents. The oceans do not run into each other but are separated by these boundaries, such as the Atlantic Ocean being separated from the Pacific Ocean by the Americas.
commas
If you mean the heart, the atria are separated from each other by the atrial septum. If you mean the atria from the ventricles, the right is separated by an AV valve called the tricuspid. The left by a an AV valve called the bicuspid or mitral valve.
commas
The chromatids are first separated from each other during the anaphase stage of meiosis.
The north and the south hemisphere are separated by the equator!
nothing
You are two people who are married to each other who are separated.
When two or more companies are merged with their assets and liabilities, they are called merger. Whereas when they are separated/detached from each other,they are called demerger.