2 What could the reader infer from the reading about hydrocarbons?
A
Life started on other planets before it started on Earth.
B
All planets and satellites in the solar system contain hydrocarbons.
С
The building blocks of carbon-based life are found on planets or
satellites other than Earth.
D
D
No bodies in our solar system except Earth contain hydrocarbons.

the number of valence electrons for each molecule or ion is shown beneath the structure. remember hydrogen will not have more than two electrons. this hydrogen is part of a covalent bond (sharing two electrons). a double bond here would cause hydrogen to share four electrons with phosphorus.

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.