I'm doing a lab report, and we are looking at an onion cell under a microscope. the teacher asks to explain why we put iodine on the sell. (answer)= cleaning it ?

No. You putting iodine solution is not for cleaning the onion but actually testing for starch. Onion is a plant that makes food. Thus, onion contains starch. If you put iodine solution onto starch-present organism. the brown solution will change to darkblue solution or blueblack solutiom due to the presence of starch. If there is no starch present, the solution will remain brown. Hence, the iodine solution is npt for cleaning but for testing for the presence of starch.

If you open the bottle of perfume then nothing but the smell will come out of it and yes it is a type of gas smell because it’s say it in english so i can understand better and you

Green is technically every other color but green but the other wavelengths of the other colors get absorbed by the object and the wavelength of the color green gets reflected