Question

A zoology student is investigating whether it is true that the gender of turtles depends on the temperature at which the turtle eggs are kept before they hatch. He will test if turtle eggs incubated at 29–30 degrees Celsius produce females, and eggs at 24–26 degrees Celsius produce males. What is the independent variable?

Answer 1

the independent variable is the time as it is independent of the gender
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Answer 2

There are actually three types of variables which can be defined here.

Independent variable- The temperature, which the student can control. As he's putting the eggs in such a temperature he want.

Dependent variable- This is what changes due to the dependent variable. Here it is the gender of the turtles.

Controlled variable- Which the student chose for the experiment. That is he used eggs of turtle instead of other species.