The graph below plots the temperature and luminosity of stars on the main sequence. Which of these stars had an initial mass greater than the initial mass of the sun? Star 1 and Star 2
Star 3 and Star 4
Star 1 and Star 4
Star 2 and Star 3

answer : a model is often used to explain and make things easier to understand when any scientific topic needs to be demonstrated and explained.

as in this case where a scientist wants to use a model to present the results of his detailed scientific investigation. he should do it as it will him to make the audience understand the concept in a much better way. also, it can be changed according to new scientific understandings.

the positions which points up in upward carbon and down in downward carbon are axial

and vice versa holds true for equatorial positions

so the correct answer with labelled diagram will be

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