In an experiment, 90 newborn flies are divided evenly into three separate
groups and placed in boxes inside an incubator that is maintained at a
constant temperature of 30°c. on a daily basis, the first group is given water
containing 1 mg/ml of sugar, the second is given water containing 2 mg/ml
of sugar, and the third is given water containing 3 mg/ml of sugar. after four
weeks, the average length of the flies in each group is determined.
which factor is the independent variable in this experiment?
a. concentration of sugar in the water
b. average length of flue in a group
c. temp of the incubator
d. number of flies in a group

B. Average length of flies in a  group

The factor that is independent variable in this experiment is temperature of the incubator

Explanation:

From the above experiment, what determines the length of the flies above is the concentration of sugar intake, the more sugar intake by each group the higher their length which makes concentration of sugar the dependent factor while the temperature is an independent factor as it does not determine the flies length, hence; its an independent factor

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