N detail, describe the structures and functions of at least 3 body systems and explain how the body systems work together. You must write AT LEAST 8 sentences. pleas help

indium, and thallium have three electrons i think

every chemical equation adheres to the law of conservation of mass, which states that matter cannot be created or destroyed. therefore, there must be the same number of atoms of each element on each side of a chemical equation.

im doing test rn im going with 2 but ill give answer if itss wrong,   : )