Answer: system.
Explanation:
You have to complete the sentence by filling in the blank:
Drag the beaker of water onto the support. The internal energy of water will be analyzed, which makes water the ____________ being studied.
The answer is system and the full sentence is:
Drag the beaker of water onto the support. The internal energy of water will be analyzed, which makes water the system being studied.
Justification:
In thermodynamics, physics, chemistry, biology, or related sciences, a system is the part of the universe, matter or process, that is under study.
Since, it is the internal energy of the water contained in the beaker, means that you are interested in that specific part of the universe.
All what is not part of the system but can inlfuence it is called the surroundings. For example, the beaker, and any external influence over the beaker and the water, are the surroundings.
