Question

four plants are grown using the same light, soil, humidity, and temperature. plant a: 100% water plant b: 99% water : 1% fertilizer plant c: 98% : 2% fertilizer plant d: 97% water : 3% fertilizer plant height is measured daily for three weeks. what are the control variables? check all that apply. humidity water soil fertilizer

Explanation:

Control variables are kept constant in an experiment to isolate the effect of the independent variable. Here, light, soil, humidity, and temperature are held the same for all plants. Water and fertilizer amounts vary among plants, so they are not control variables.

Answer:

Humidity, Soil