The expression of a trait is directly dependent on the

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Sarah performs an experiment to determine the effect of nitrogen on plants. she studies the effect of nitrogen on the growth of the root hair, height of the plants, and nodule formation. which factor is an independent variable?

Suppose you are studying two stars. both stars have the same apparent magnitude, but star a has a greater absolute magnitude than star b. what can you tell about the distance from earth of these two stars?