If you were descending through the ocean zones in a submersible, which would be the first zone you encounter that is entirely without light?

The answer is Bathypelagic zone.

This zone is also called as midnight zone, being a part of pelagic zone it extends upto 1,000 to 4,000 meter below the surface of ocean. It lies between the mesopelagic and abyssopelagic zone. Sunlight does not reaches this zone. There are no plants in this zone because it lacks sunlight and hence no photosynthesis takes place there. Some fishes in this region have no eyes.

the real answer is b. scintillation counter

1. the energy lost to disorder metabolism     -entropy

2. related to or possessing motion potential     -kinetic

3. all of the chemical reactions in an organism required for maintenance of the processes of life entropy     -metabolism

4. possible; ability to go into action or perform work kinetic     -potential

5. the study of energy and its transformations thermodynamics     -thermodynamics