What do scientists call a factor that can change during an experiment?

Maria compares plant growth in clay, sand, and loam while keeping other conditions the same. Which role does the soil type have?

Mary tests whether warmer water makes salt dissolve faster. Which measurement should she use to compare the outcomes?

Liza tests how water temperature affects instant coffee's dissolving time. Which pair of trials gives the fairest comparison?

Pechay groups receive equal water each day while soil nitrogen levels differ. What role does the daily water amount have?

Mary compares garden tomatoes outdoors with tomatoes in small pots indoors. Why can she not attribute growth differences to light alone?

Before testing gum removal, Mara writes, "If ice is applied, then gum will be easier to remove." What has Mara written?

Paolo investigates whether magnet size affects its ability to attract paper clips. Which result should he record?

In "If water is warmer, then sugar will dissolve sooner," what does the part after "then" describe?

Mara tests which material removes gum most effectively. Which plan best isolates the effect of the material?

Katrina records plant heights in centimeters. What kind of data is she collecting?

Katrina records, "Some leaves are turning yellow." What kind of record is this?

Use Maggie's table. What was the height of the plant given plain water in week 4?

Alfred expects the warmest time near noon; Sarah expects it near 3 P.M. Whose prediction does the graph support?

Use the table. What can be concluded about adding sugar and vinegar in this experiment?

George predicted that Fertilizer A would produce taller tomato plants than Fertilizer B. What do the results indicate?

Ana predicted faster dissolving at 50 °C than at 40 °C. Trials took 70 and 72 seconds at 40 °C, and 71 and 71 seconds at 50 °C. Which revision fits?

Carlo predicted 60 seconds, but measured 1 minute 12 seconds. Which entry belongs in the 'Measured time (s)' column?

How can Maria make her coffee test less affected by an unusually fast or slow trial?

After analyzing her plant investigation, Katrina presents her findings to classmates. What step is she carrying out?