Each cell has a membrane. This is a thin layer that surrounds it. It keeps the inside and outside of the cell separate. What does the word "surrounds" mean? A fully supports B stands alone C pulls apart D totally covers

Silver tarnishes as silver metal reacts with hydrogen sulfide, h2s, in the air. in this reaction, dark silver sulfide, au2s, covers the surface of silver. when silver is polished, this coating of silver sulfide can be removed from the surface. this makes the silver shiny again. enter the coefficients that balance the tarnishing reaction equation. (type 1 for no coefficient.)

Structure of the atoms: discovery of the nucleus in 1909i need answering all of these questions

Which samples do the atoms have the least kinetic energy