What are stem careers that work closely with cells?

Chemical engineering, bio/ biomedical engineering

There are so many, depends on the type of cells and what you want to be doing with them. You could work in a manufacturing lab growing vats of various cells for use in other labs or you could be a pathologist, virologist or microbiologist studying prokaryotic cells and pathogens or biomedical engineer or biochemist growing clumps of cells into tissue for skin grafts or organ transplant. You could be a molecular biologist and study/alter DNA of different types of cells or any type of drug, personal care product or chemicals are often tested on living cells for toxicology or efficacy puposes.

True statement gravity force is more on bigger mass, less on smaller mass.all mass fall on planet with same acceleration and speeds