A soap manufacturer wants to prove that their detergent works better to remove tough
stains. What is the independent variable?

i believe the correct answer is d

and i oop

explanation:

he movement of air through earth's or any planet's atmosphere is called wind, and the main cause of earth's winds is uneven heating by the sun. this uneven heating causes changes of atmospheric pressure, and winds blow from regions with high pressure to those with low pressure.

i hope this : )