The correct answer is letter B.
Explanation: Even for the best studied star we can only measure 4 parameters: mass, luminosity, radius and chemical composition of the outer layers. We can determine the structure of the star with these parameters, because we have one more condition: the constancy of the stars over long periods of time. Even variable stars have long-term stability of the average structure. The existence of fossil algae on the earth over 1 billion years old and fossils up to 3.5 billion years old is evidence that the temperature of the earth cannot have changed by more than about 20 ° C. Therefore, the interior of the stars must be in perfect balance.
Can you ask in english please?
Mental illness occurs when symptoms of depression manifest mostly psychological depressed moods, while physical illness results from depression manifested as physiological symptoms like loss of appetite.
Depression, which results from <em>loss of interest</em>, can be traced to psychological or physiological factors. Since depression is a medical condition, there is always the need to identify the drivers for appropriate treatment.
Thus, psychological depression manifests as a mental illness, while physiological depression manifests as a physical illness.
Learn more: brainly.com/question/16342878