Question

Which scientific investigation does not include dependent and independent variable?

1.observing and counting bird populations
2.studying the effect of temperature on bacterial reproduction rates
3.investigating the effect of mass on the speed at which an object falls
4.testing a model car's air flow resistance at different wind speeds in a wind tunnel

Answer 1

Bird Population

Step-by-step explanation:

Smallest answer ig Imao and it doesnt have an independent variable/cause or dependent/ effect

Answer 2

1

Step-by-step explanation:

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