Question

in her laboratory, ling studied the movements of tiny roundworms, which she kept in petri dishes containing worm food. she placed the same number of healthy worms on each of 18 dishes. ling kept six of the dishes at 15°c, six dishes at 20°c, and six dishes at 25°c for one hour. using a microscope, ling recorded 30 - second videos of the worms on each dish. later, she watched the videos and calculated the average speeds of the worms as they moved. a roundworm under a microscope identify the question that ling’s experiment can best answer. does the number of worms on each dish affect how fast the worms move? is a worm’s speed affected by the temperature of its surroundings? does temperature affect the number of minutes per day that worms spend moving?

Explanation:

Ling's experiment varies temperature (15°C, 20°C, 25°C) and measures worm speed. The question "Is a worm’s speed affected by the temperature of its surroundings?" directly relates to the independent variable (temperature) and dependent variable (worm speed) in her experiment. The other questions involve the number of worms (not varied here, as each dish has the same number) or time spent moving (not measured as she measured speed during 30 - second videos), so this question is best answered by her experiment.

Answer:

Is a worm’s speed affected by the temperature of its surroundings?