Make a CER for the Density Block Activity that explains how you proved items that float in water will have less than a certain density and items that sink in water will have more than a certain density Claim- Evidence- Reasoning​

it's all four options.

i think it's letter a.

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.