Question

Julia wants to find out which color fabric will heat up the fastest when put under a direct light. So, she places pieces of red, white, and green fabrics outside in the sunlight. Then, she places pieces of black, yellow, and blue fabric inside under a bright lamp. Finally, she measures the temperature of all the fabric samples every 5 minutes. Will Julia's results be valid? A. No, she has more than one independent variable. B. Yes, she is conducting a controlled experiment. C. No, she should only test one color of fabric at a time. D. Yes, all scientific investigations are valid.

Answer 1

I NEED HELP GUYS ;-;