Answer:
Luminosity is an intrinsic(natural) measurable property of a star independent of distance. The concept of magnitude, on the other hand, incorporates distance. The apparent magnitude is a measure of the diminishing(decrease) flux of light as a result of distance according to the inverse-square law.
An example of a parallel choice on a dichotomous key is happy or sad and old or young. Either one of those answers.
Answer:
C.
It controls the entry and exit of substances.
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