For the question: how does the number of steps ups affect your heart rate? What is the independent variable?
What is the dependent variable?​

i believe it is-

d.) gravity pulled particles of dust and gas together to form planets.

it forms an anion that has a larger radius. anions have a negative charge and are larger than the original atom.

on passing the small ampere of electric current through the tube made of ar and hg of cfl generates uv rays which excites the fluorescent and thus emits the high radiation by consumption of just 5- 12 w in comparison to incandescent light which requires more power such as around 40 - 55 w to lighten.

moreover the life span of fluorescent or cfl is around 8000 h whereas the life span of incandescent is around 1200 h

hence, the building installed with incandescent lights bears more electricity bill.