I am a cell in the human body. My parents came from the ectoderm. People don't think I have an important job in my tissue, but I am great at helping the popular cells do their job. What kind of cell am I?

Tin has ten stable isotopes. the heaviest, 124sn, makes up 5.80% of naturally occuring tin atoms. how many atoms of 124sn are present in 82.0 g of naturally occurring tin? what is the total mass of the 124sn atoms in this sample?

In salt water solution,the salt is the blank

Is a chemical message sent by another individual.