Gye-Min was so engrossed in studying for his upcoming midterm exam that he did not notice how hungry and thirsty he was until his stomach started growling. The brain structure responsible for regulating behavior related to survival, such as hunger and thirst, is called the and is part of the system.

Hypothalamus; limbic                                                

Explanation:

Hypothalamus: The term "hypothalamus" is described as a small region inside an individual's brain and it is being located at the brain's base, near to the pituitary gland. It plays an important role in regulating body temperature and metabolic processes, releases hormones, controls hunger, sleep, thirst, etc.

Limbic system: The term "limbic system" is described as a specific set of structures in an "individual's brain" that generally deals with memory and emotions. However, it regulated the endocrine and autonomic function in regards to emotional stimuli.

In the question above, the given statement represents hypothalamus and limbic system.

productive most commonly means: achieving or producing a significant amount or result.

explanation:

productive can also mean:

these depend on how the word productive is used. most likely productive will mean   achieving or producing a significant amount or result.

answer; lorenz;